Last visit was: 20 Nov 2025, 07:46 It is currently 20 Nov 2025, 07:46
Home
GMAT
Messages
Tests
Schools
Events
Rewards
Chat
My Profile
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
   1   2   3   4   5   
User avatar
Harshita21988
User avatar
Joined: 14 Jun 2023
Last visit: 14 Mar 2025
Posts: 27
Own Kudos:
22
 [1]
Given Kudos: 27
Posts: 27
Kudos: 22
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:22
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Answer D. Explanation - A isn't properly arranged. B could have been my second guess as the tone somewhat seems right. C are dotting the lines seems absurd. E 'are dug' should have been 'were dug'

Posted from my mobile device
User avatar
l88
User avatar
Joined: 04 Mar 2021
Last visit: 26 Jun 2024
Posts: 26
Own Kudos:
30
Given Kudos: 104
Posts: 26
Kudos: 30
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:26
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.


 


This question was provided by Experts Global
for the Around the World in 80 Questions

Win over $20,000 in prizes: Courses, Tests & more

 

Show more

The hills... are dotted.
mines are dug.
above two logic leave only option E.
User avatar
CICCIO2
User avatar
Joined: 01 Jul 2023
Last visit: 27 Jul 2023
Posts: 2
Own Kudos:
4
Posts: 2
Kudos: 4
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:34
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A, C, D and E are all satisfying choices and we keep them,
but B just sounds better and therefore it's our answer
User avatar
UkrHurricane
User avatar
Joined: 04 Dec 2017
Last visit: 15 Nov 2025
Posts: 50
Own Kudos:
59
 [1]
Given Kudos: 429
Location: Ukraine
Concentration: Finance, Human Resources
Schools: Simon '27
GMAT 1: 580 Q38 V32
GMAT 2: 590 Q49 V23
GMAT 3: 580 Q43 V27
GMAT 4: 630 Q45 V31 (Online)
GMAT 5: 670 Q47 V35 (Online)
GPA: 3.4
Schools: Simon '27
GMAT 5: 670 Q47 V35 (Online)
Posts: 50
Kudos: 59
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:36
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.


 


This question was provided by Experts Global
for the Around the World in 80 Questions

Win over $20,000 in prizes: Courses, Tests & more

 

Show more

IMO it is between C and D, and the correct answer should be D

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

This option is incorrect as the hills were not dug; copper mines were.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.

Same problem as in A

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.

This one is good, but present continuous seems to be off here. Eliminate.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.

In this option, 'them' could potentially be a problem, but the closest plural noun here is 'mines', and there seems to be no ambiguity that 'them' refers to 'mines'.

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.

'are dug' is incorrect because it happened a century ago.
User avatar
SignUp
User avatar
Joined: 09 Jun 2022
Last visit: 11 Apr 2024
Posts: 35
Own Kudos:
15
 [1]
Given Kudos: 46
Location: India
Schools: HEC Sep'24 Intake INSEAD Aug'24 intake Oxford Said'25 CEIBS'26 ISB '25 IE Sep'24 intake IESE '26 SDA Bocconi'25
GMAT 1: 720 Q49 V40
GPA: 3.0
Schools: HEC Sep'24 Intake INSEAD Aug'24 intake Oxford Said'25 CEIBS'26 ISB '25 IE Sep'24 intake IESE '26 SDA Bocconi'25
GMAT 1: 720 Q49 V40
Posts: 35
Kudos: 15
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:38
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines. (Many of them dug incorrectly refers to the hills instead of copper Mines)
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.Same problem as (A)
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.Are dotting the hills of Arizona is incorrect , dot the hills to the east of Death Valley would be better
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.Correct Answer
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.most of which are ... tense issue , were corrects this
User avatar
nivivacious
User avatar
Joined: 10 Mar 2015
Last visit: 18 Aug 2024
Posts: 240
Own Kudos:
302
Given Kudos: 175
Location: India
Concentration: Strategy, Marketing
GPA: 3.5
WE:Advertising (Advertising and PR)
Posts: 240
Kudos: 302
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:39
Kudos
Add Kudos
Bookmarks
Bookmark this Post
(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
This sentence is grammatically incorrect because it lacks a clear subject in the first clause

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
The placement of the phrase "dug during the Greenwood copper boom a century ago" at the beginning of the sentence is slightly confusing.

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
The use of 'are dotting' is wrong here

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
This is correct

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.
"are dug" should be "were dug" to correctly use the past tense.
User avatar
KanikaJain
User avatar
HEC School Moderator
Joined: 06 Jan 2021
Last visit: 20 Nov 2025
Posts: 196
Own Kudos:
49
Given Kudos: 22
Location: India
Concentration: Finance, Human Resources
Schools: LBS '26 (S) CBS '26 (S) Johnson '26 (S) HEC Sept '26 (A) ISB '26 (S)
GMAT Focus 1: 645 Q83 V84 DI79
GPA: 4
Schools: LBS '26 (S) CBS '26 (S) Johnson '26 (S) HEC Sept '26 (A) ISB '26 (S)
GMAT Focus 1: 645 Q83 V84 DI79
Posts: 196
Kudos: 49
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:41
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines. - modifier error

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines. - modifier error

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona. - correct

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago. - the hills are still dotted

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago. - the hills are still dotted
User avatar
ladu
User avatar
Joined: 03 Jun 2023
Last visit: 11 Feb 2024
Posts: 29
Own Kudos:
27
 [1]
Given Kudos: 122
Location: United States (IN)
Concentration: Marketing, Organizational Behavior
Schools: Kelley UNC Kenan-Flagler Emory Goizueta Fuqua '26 Tepper '26 Mendoza
GPA: 4
WE:Marketing (Education)
Schools: Kelley UNC Kenan-Flagler Emory Goizueta Fuqua '26 Tepper '26 Mendoza
Posts: 29
Kudos: 27
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 09:43
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
-Suspected incorrect.
Rationale: Bracketing commas used. When removing the statement between the bracketing commas, it appears to be impact the sentence structure. This information could not be omitted without impacting the sentence.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
-Suspected incorrect.
Rationale: Bracketing commas used. When removing the statement between the bracketing commas, it appears to be impact the sentence structure. This information could not be omitted without impacting the sentence.

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
-Suspected correct.
Rationale: Bracketing commas used. When removing the statement between the bracketing commas, it does not appear to impact the sentence structure. The information could be omitted.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
-Suspected incorrect.
Rationale: Bracketing commas used. When removing the statement between the bracketing commas, it appears to be impact the sentence structure. This information could not be omitted without impacting the sentence.

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.
-Suspected incorrect.
Rationale: Bracketing commas used. When removing the statement between the bracketing commas, it appears to be impact the sentence structure. This information could not be omitted without impacting the sentence.
User avatar
Shadyshades
User avatar
Joined: 02 Nov 2020
Last visit: 20 Nov 2025
Posts: 118
Own Kudos:
84
 [1]
Given Kudos: 1,101
Location: India
Schools: Yale '20 (D)
GMAT 1: 220 Q2 V2
Schools: Yale '20 (D)
GMAT 1: 220 Q2 V2
Posts: 118
Kudos: 84
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:13
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.


 


This question was provided by Experts Global
for the Around the World in 80 Questions

Win over $20,000 in prizes: Courses, Tests & more

 

Show more

Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

The modifier "many of them dug" should modify "copper mines". Here, it's modifying "hills". Why do you want to dig hills when you have copper mines around :dontknow: Eliminate A.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.

Option B faces the same issue as in A.

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.

In option C, it seems Copper mines performing the action of dotting the hills. Instead, the hills are dotted with 100s of mines. Moreover, the action of dotting may or may not be happening at this very moment so present continuous is not required. Eliminate Option C.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.

Perfect. "Cu mines" is next to "most of them dug" , "Arizona" is next to "The hills to the east of Death Valley". Moreover, the sentence makes sense i.e. the hills are dotted with 100s of Cu mines.

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.

Run on error. "Most of which are..." We don't need verb "are" as it creates run on error. 2 independent sentences can't be placed together with just "comma". Eliminate Option E.
User avatar
vedha0
User avatar
Joined: 10 Jan 2023
Last visit: 17 Mar 2024
Posts: 121
Own Kudos:
124
Given Kudos: 58
Posts: 121
Kudos: 124
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:26
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

its clear the sentence is talking about the copper mines which have been dug during a certain era. In the sentence's current state, "them" can also refer to hills. same goes for option B. both option A and B do not eliminate the ambiguity regarding THEM pronoun. So, if we find a better option we can drop these 2.

Option C eliminates the ambiguity and correctly points to the mines dotting along the hills. So we hold on to C, and we eliminate A and B

Option D is as good as option C except that in option D, them might refer to hills, since its the nouns preceding mines. This is not wrong per se but we have a better choice with option C as all ambiguity is eliminated. So, we eliminate D and hold on to C

Option E uses "are dug" which is present perfect tense. The mines are still not being dug, so eliminate E

Therefore answer is C
User avatar
TargetKellogg2024
User avatar
MBA Section Director
Joined: 25 Apr 2018
Last visit: 19 Nov 2025
Posts: 442
Own Kudos:
732
 [1]
Given Kudos: 159
Location: Germany
GMAT 1: 680 Q47 V36
GMAT 2: 650 Q50 V28
GMAT 3: 710 Q49 V37
GRE 1: Q170 V163
Products:
My Reviews
GMAT 3: 710 Q49 V37
GRE 1: Q170 V163
Posts: 442
Kudos: 732
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:41
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
- the phrase "Many of them" could refer to the hills, the copper mines, or the people who dug the mines.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
- the phrase "Many of them" could refer to the hills, the copper mines, or the people who dug the mines.

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
- Incorrect usage of "are dotting". It is in the present tense, but the phrase "during the Greenwood copper boom a century ago" is in the past tense.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
- Correct!

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.
- The phrase "most of which are dug during the Greenwood copper boom a century ago" is awkward and grammatically incorrect. Also, "are" is incorrect tense form.
User avatar
Niddd
User avatar
Joined: 22 Dec 2022
Last visit: 20 Nov 2025
Posts: 30
Own Kudos:
71
 [1]
Given Kudos: 166
Posts: 30
Kudos: 71
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:47
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
This states that the hills were dug, and not the mines. Hills cannot logically be dug.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
Same issue as A and, "with many hundreds" is wordy and a better alternative is "with hundreds."

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
Removing the subordinate clause one is left with "Hundreds of copper mines are dotting the hills..." This does not make sense. It would be better to say that the hills are dotted with.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
Clear, concise and corrects the initial errors.

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.
There is an issue with tense in: "most of which are dug". "Are" cannot be used as this is something that occurred in the past.

Answer D
User avatar
missionmba2025
User avatar
Joined: 07 May 2023
Last visit: 07 Sep 2025
Posts: 341
Own Kudos:
427
 [1]
Given Kudos: 52
Location: India
Posts: 341
Kudos: 427
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:50
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.

 


This question was provided by Experts Global
for the Around the World in 80 Questions

Win over $20,000 in prizes: Courses, Tests & more

 

Show more

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

Incorrect placement of modifier. The hills were not dug during Greenwood copper boom.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.

Incorrect placement of modifier. The hills were not dug during Greenwood copper boom.

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.

The use of present continuous tense gives a meaning that the copper mines are dotting the hills as we speak. Illogical.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.

Correct. The modifiers are placed correctly and the meaning is clear.

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.

Run on sentence. Two Independent clauses are connected via a comma. Eliminate

IMO D
User avatar
Kinshook
User avatar
Major Poster
Joined: 03 Jun 2019
Last visit: 20 Nov 2025
Posts: 5,794
Own Kudos:
5,515
Given Kudos: 161
Location: India
Schools: HBS '26 CBS '26 Wharton '26
GMAT 1: 690 Q50 V34
WE:Engineering (Transportation)
Products:
My Reviews
Schools: HBS '26 CBS '26 Wharton '26
GMAT 1: 690 Q50 V34
Posts: 5,794
Kudos: 5,515
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:52
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
Many of them dug during the Greenwood copper boom a century ago modifier is NOT modifying the hills to the east of Death Valley, Arizona
Incorrect.

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
The hills to the east of Death Valley, Arizona were NOT Dug during the Greenwood copper boom a century ago
Meaning of the sentence is NOT correct.

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
Hundreds of copper mines are dotting the hills to the east of Death Valley, Arizona.
Is NOT a correct sentence. whereas
the hills to the east of Death Valley, Arizona are dotted with hundreds of copper mines
is correct.

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
most of which are dug is the correct usage

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.
Correct

IMO E
User avatar
ak232323
User avatar
Joined: 19 Jun 2021
Last visit: 30 May 2024
Posts: 8
Own Kudos:
2
 [1]
Given Kudos: 1
Location: India
Posts: 8
Kudos: 2
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 10:56
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
Incorrect: century ago -the hills not right modifier

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
incorrect: same modifier issue

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
incorrect: past but using present tense

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
Correct


(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.
incorrect: most of which
User avatar
poojaarora1818
User avatar
Joined: 30 Jul 2019
Last visit: 20 Nov 2025
Posts: 1,543
Own Kudos:
732
 [1]
Given Kudos: 3,425
Location: India
Concentration: General Management, Economics
Schools: Duke '26 Haas '26 Kelley '26 Kellogg '26 McDonough '26
GPA: 3
WE:Human Resources (Human Resources)
Products:
GMAT Club Tests
Schools: Duke '26 Haas '26 Kelley '26 Kellogg '26 McDonough '26
Posts: 1,543
Kudos: 732
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 11:06
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.IncorrectNon-sensical

(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.Incorrectmakes no sense. It seems like two phrases modifying the noun "Arizona"

(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona. Incorrect[b]This sentence a set of phrases[/b]

(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.CorrectMakes sense

(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.Incorrect The last one" most of-------" modify Arizona which is quite far off
User avatar
mendax
User avatar
Joined: 23 Aug 2021
Last visit: 23 May 2024
Posts: 37
Own Kudos:
68
Given Kudos: 14
WE:Design (Energy)
Posts: 37
Kudos: 68
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 11:06
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.


 


This question was provided by Experts Global
for the Around the World in 80 Questions

Win over $20,000 in prizes: Courses, Tests & more

 

Show more

Eliminations:
A=> There is no subject before them which it can refer to
B=> No relation between dug and copper mines, changes the meaning of the statement given
D=> "them" here can refer to either hills or copper mines. Ambiguous
E=> "which" here can refer to either hills or copper mines. Ambiguous
IMO Option C
User avatar
vishal_gupta
User avatar
Joined: 11 May 2023
Last visit: 14 Jun 2025
Posts: 78
Own Kudos:
118
 [1]
Given Kudos: 46
Location: India
Concentration: General Management, Strategy
Schools: Yale '27 Booth '27 HEC '26 INSEAD '26 LBS '26 IIM IIM Kellog '27 Judge '26 Said '27 Tuck '27 Stern '27 ISB '27
GMAT Focus 1: 675 Q88 V81 DI82
GPA: 76%
WE:Engineering (Non-Profit and Government)
Schools: Yale '27 Booth '27 HEC '26 INSEAD '26 LBS '26 IIM IIM Kellog '27 Judge '26 Said '27 Tuck '27 Stern '27 ISB '27
GMAT Focus 1: 675 Q88 V81 DI82
Posts: 78
Kudos: 118
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 11:09
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines.
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which are dug during the Greenwood copper boom a century ago.


 


This question was provided by Experts Global
for the Around the World in 80 Questions

Win over $20,000 in prizes: Courses, Tests & more

 

Show more

A & B are out due to incorrect reference of the modifier to the hills.

C is out because of usage of present continuous tense.

E out due to usage of simple present tense while presenting a case of century ago.

D is correct.
User avatar
PK1
User avatar
Joined: 11 Aug 2018
Last visit: 14 Jun 2025
Posts: 96
Own Kudos:
143
 [1]
Given Kudos: 47
Products:
My Reviews
Posts: 96
Kudos: 143
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 11:13
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.

(A) Many of them dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines.
Them here refer to the subject "the hills", however meaning requires mines are dug
(B) Dug during the Greenwood copper boom a century ago, the hills to the east of Death Valley, Arizona, are dotted with many hundreds of copper mines
Dug here modifies the hills rather than copper mines
(C) Hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago, are dotting the hills to the east of Death Valley, Arizona.
Them here refer to mines but the active voice change the meaning of the sentence as if mines are dotting the hills rather than hills are dotted (meaning marked) with
mines
(D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.
Answer. Them here refer to closest noun mines and refer to the action being dug done during a century ago and seems correct
(E) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of which aredug during the Greenwood copper boom a century ago.
Here it seems there are two sentences which are connected by comma rather than a FANBOYS conjunction. Hence it seems incorrect
User avatar
samdoesthegmat
User avatar
Joined: 16 Jul 2023
Last visit: 07 Jan 2024
Posts: 6
Own Kudos:
26
 [1]
Given Kudos: 5
Posts: 6
Kudos: 26
 [1]
Around the World in 80 Questions (Day 1): Many of them dug during the 17 Jul 2023, 11:25
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
The correct response is, (D) The hills to the east of Death Valley, Arizona, are dotted with hundreds of copper mines, most of them dug during the Greenwood copper boom a century ago.

This sentence correctly communicates the intended meaning of this sentence. It has a logical flow, as it is clear that it is the hills that are dotted with hundreds of copper mines, and that most of these copper mines were dug during the boom. It leaves no room for confusion about whether the hills or the mines were dug. This sentence is also equipped with all of the proper modifiers and tenses.
   1   2   3   4   5   
Moderators:
GMATNinja
GMAT Club Verbal Expert
7443 posts
GMATNinjaTwo
GMAT Club Verbal Expert
231 posts
miag
189 posts