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Industrialization and modern methods of insect control have improved

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New post Updated on: 01 Oct 2018, 16:38
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Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.


(A) while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

(B) while at the same time introducing some 100,000 dangerous chemical pollutants that have

(C) while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having

https://www.nytimes.com/2000/11/28/science/negotiators-focus-on-dirty-dozen-pollutants.html

Industrialization and modern insect control have improved the quality of life around the globe, but they have also added some 100,000 chemical compounds that, some scientists worry, could affect the health of people and wildlife. These persistent organic pollutants, known as POP's, have gone virtually unregulated since they were developed more than 50 years ago.

Originally posted by paeagain on 12 Oct 2008, 21:17.
Last edited by hazelnut on 01 Oct 2018, 16:38, edited 3 times in total.
Renamed the topic and edited the question.
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 12 Oct 2008, 21:40
paeagain wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having


go with B between A and B.

They is ambigious in A.
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 12 Oct 2008, 22:29
GMAT TIGER wrote:
paeagain wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having


go with B between A and B.

They is ambigious in A.


Isn't they referring to the compound subject "Industrialization and modern methods of insect control" ??

Plus "have improved" needs "have introduced" to parallel ?

Why cant it be C ? "which" is referring to chemical pollutants because "at the same time" seems to be modifying chemical pollutants..

I am not able to decide between B and C :(

What is the OA ?
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 13 Oct 2008, 00:45
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paeagain wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having


While at the same time seemed redundant !! hence opted E
But alass OA is B !!

i dont know how to deal with SC
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New post 14 Oct 2008, 07:32
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amitdgr wrote:
GMAT TIGER wrote:
paeagain wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having


go with B between A and B.

They is ambigious in A.


Isn't they referring to the compound subject "Industrialization and modern methods of insect control" ??

Plus "have improved" needs "have introduced" to parallel ?

Why cant it be C ? "which" is referring to chemical pollutants because "at the same time" seems to be modifying chemical pollutants..

I am not able to decide between B and C :(

What is the OA ?


This is correct: that they refers to "Industrialization and modern methods of insect control".

"Which" in C is wrongly used.
"Having" in A is wrongly used.
Nothing much to say about D and E.

I think "they" is redundant but understood..

So B.
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New post 14 Oct 2008, 08:09
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B is correct. I don't know about all of you but I don't go by the rules of grammar at all. In fact, I don't even know more than half the technical things that you all discuss. I am sure when I was in school I read and learnt those things but they have been long forgotten. I simply go by the way I WOULD speak a particular sentence. English is a strange language in a certain sense. What may seem correct in one context may not seem correct in another. The only way to tackle these questions, I think, is to imagine yourself speaking the sentence with your eyes closed and feel if it sounds alright. Now, this may not work for everybody but it does for me.
This particular question, it is my belief, is a perfect example that there are no rules in English (if you know what I mean)!
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 12 Aug 2009, 21:37
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ugimba wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having

please explain your reasoning..


To me a structure of the sentence has the following logic:

Industrialization and modern methods...have improved the standard of living...while introducing dangerous chemical pollutants...[polutants] have gone unregulated since they (pollutants) were developed...

using 2/3 rule:
While vs. but - While wins. so we can eliminate D&E
In C "which" modifies time
A says that "Industrialization and methods of insects contorol..having gone (sounding awkward at least) unregulated." I think the meaning is distorted.

So B wins.
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New post 13 Jun 2010, 08:20
while at the same time is not wordy??

I mean redundant. Could anybody please clarify?

Thanks,
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New post 30 Jun 2010, 08:38
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Its close between B & D.
I will go with B as 'that' clause in the end modifies pollutants that have gone unregulated.
'that' clause modifies time in D instead of pollutants located in the end of sentence.
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New post 30 Jun 2010, 10:25
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noboru wrote:
while at the same time is not wordy??

I mean redundant. Could anybody please clarify?

Thanks,


not redudant at all...

while (signals contrast) at the same time (signals 'in conjunction with') ... how's that redundant?
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New post 07 Dec 2010, 08:54
1
ugimba wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having

please explain your reasoning..


" while at the same time they have introduced" in A they has no clear referent plus ...having... is not a good construction. B is the ans. The elimination of the rest of the choices has already been explained :)
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 09 Sep 2014, 09:59
1
ugimba wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having

please explain your reasoning..


A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having - Having gone virtually unregulated introduces a cause-effect scenario, but there is no such cause and effect relationship here. E.g. He felt sick, having eaten too much.
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have - This is grammatically correct. The Simple Present introducing is used here in order to show that the pollutants can still be introduced. The methods in question are not done introducing pollutants, they are still capable of introducing pollutants.
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have - Changes the meaning by misplacing "at the same time". Also "which" incorrectly modifies time instead of pollutants
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have - Changes the meaning like C because of the placement of "at the same time"
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having - Having introduces an incorrect cause-effect scenario, just as A
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 30 Jun 2015, 21:46
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paeagain wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having


POE

A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
Incorrect - Ambiguous modifier ", Having" it has potential to modify pollutants and They (Industrialization and modern methods of insect control) Hence sentence is not clear to present an Idea.

B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
Correct
1. introducing - Ving modifier modifies the subject of preceding clause ( Industrialization and modern methods of insect control)
2. That - correct modify Pollutants.


C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
Incorrect -
1. Change of Meaning (Sin in GMAT SC) ,
Original Meaning - "At the same time, they have introduced 100,000 pollutants"
Meaning in option - "They have introduced 100,000 pollutant at the same time.

2. "Time, which" - which is modifying the time, Time modifier is when. Even tough Which modifies time, it introduced change in meaning by saying " Time gone viral .. "



D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
Incorrect - Here But introduced an Independent clause and has no verb in it.
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having
Incorrect - Here But introduced an Independent clause and has no verb in it.
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 20 Apr 2017, 21:36
vishwaprakash wrote:
paeagain wrote:
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having


POE

A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
Incorrect - Ambiguous modifier ", Having" it has potential to modify pollutants and They (Industrialization and modern methods of insect control) Hence sentence is not clear to present an Idea.

B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
Correct
1. introducing - Ving modifier modifies the subject of preceding clause ( Industrialization and modern methods of insect control)
2. That - correct modify Pollutants.


C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
Incorrect -
1. Change of Meaning (Sin in GMAT SC) ,
Original Meaning - "At the same time, they have introduced 100,000 pollutants"
Meaning in option - "They have introduced 100,000 pollutant at the same time.

2. "Time, which" - which is modifying the time, Time modifier is when. Even tough Which modifies time, it introduced change in meaning by saying " Time gone viral .. "



D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
Incorrect - Here But introduced an Independent clause and has no verb in it.
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having
Incorrect - Here But introduced an Independent clause and has no verb in it.




Hi.
Pls elaborate on this...
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
Incorrect -
1. Change of Meaning (Sin in GMAT SC) ,
Original Meaning - "At the same time, they have introduced 100,000 pollutants"
Meaning in option - "They have introduced 100,000 pollutant at the same time.
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 20 Apr 2017, 23:47
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shoumodip wrote:
[
Hi.
Pls elaborate on this...
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
Incorrect -
1. Change of Meaning (Sin in GMAT SC) ,
Original Meaning - "At the same time, they have introduced 100,000 pollutants"
Meaning in option - "They have introduced 100,000 pollutant at the same time.


I am not sure what change in meaning is referred above in these two examples, but the easiest way to eliminate C is "which have". "at the same time" is an adverb/adjective[more below] - so, "which" cannot refer back to pollutants.

All, I can see that in the second option "They have introduced 100,000 pollutant at the same time", "at the same time" is clearly ambiguous - an adverb for the action "have introduced", in line with the preceding action "have improved", or an adjective for the "1000 pollutants"[ in which case, we mean that all the pollutants were introduced at the same time, and not "at the same time" goes along with the "introduced" and "improved"]. By placing "at the same time" in the beginning, as in B, we are sure that its an adverb, thus no ambiguity. Having said that, I would not rely on this difference in exam scenario. The "which" error is enough to eliminate C in so called 2 seconds !!

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New post 22 Apr 2017, 15:19
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Can some explain to me the way 'introducing' is used in B. If it is a verb, how can it be parallel to 'have improved' ??? In case it is a present participle, how can it stand alongside 'while', which I understand is a subordinating conjunction that requires a full clause?
Thank you.
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 23 Apr 2017, 02:29
kivalo wrote:
Can some explain to me the way 'introducing' is used in B. If it is a verb, how can it be parallel to 'have improved' ??? In case it is a present participle, how can it stand alongside 'while', which I understand is a subordinating conjunction that requires a full clause?
Thank you.


"Introducing" is a present participle, not a verb. Since this is an official question, it is clear that GMAT allows usage of "while" to introduce a present participle phrase.
(It is important to align oneself with what GMAT considers right or wrong - scoring high is after all the objective.)
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New post 30 Aug 2017, 13:46
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Can someone please explain how in the world phrase "introducing some 100,000 dangerous chemical pollutants" modifies "industrialization and modern methods of insect control". As for the present participle phrase isn't it important to touch the noun its modifying.

Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time introducing some 100,000 dangerous chemical pollutants that have gone virtually unregulated since they were developed more than 50 years ago.
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Re: Industrialization and modern methods of insect control have improved  [#permalink]

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New post 31 Aug 2017, 09:16
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

(A) while at the same time they have introduced some 100,000 dangerous chemical pollutants, having

modification error : methods have improved ........ , having gone virtually unregulated : changes meaning

(B) while at the same time introducing some 100,000 dangerous chemical pollutants that have

(C) while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have

100,000 dangerous chemical pollutants at the same time : change of meaning : Incorrect

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

100,000 dangerous chemical pollutants at the same time : change of meaning : Incorrect

(E) but at the same time introducing some 100,000 dangerous chemical pollutants, having
Incorrect


Is the use of but without a 'comma' ok ?
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New post 31 Aug 2017, 10:31
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kivalo wrote

Quote:
Can some explain to me the way 'introducing' is used in B. If it is a verb, how can it be parallel to 'have improved' ??? In case it is a present participle, how can it stand alongside 'while', which I understand is a subordinating conjuction that requires a full clause?


Apart from its usage as a conjunction with a finite verb, 'while' is also used along with participles. GMAT has accepted this usage also, as can be seen below. Therefore, one cannot omit a choice on this count.

1. The themes that Rita Dove explores in her poetry is universal, encompassing much of the human condition while occasionally she deals with racial issues.
A. is universal, encompassing much of the human condition while occasionally she deals
B. is universal, encompassing much of the human condition, also occasionally it deals
C. are universal, they encompass much of the human condition and occasionally deals
D. are universal, encompassing much of the human condition while occasionally dealing
E. are universal, they encompass much of the human condition, also occasionally are dealing

OA D

2. While studying the genetic makeup of corn, a new class of mutant genes was discovered by Barbara McClintock, a discovery which led to greater understanding of cell differentiation.

A. a new class of mutant genes was discovered by Barbara McClintock, a discovery which led
B. a new class of mutant genes in corn were discovered by Barbara McClintock, leading
C. Barbara McClintock discovered a new class of mutant genes, and it led
D. Barbara McClintock discovered a new class of mutant genes, a discovery that led
E. Barbara McClintock, who discovered a new class of mutant genes, leading

The non-underline part uses while along with a participle

3. Meteor showers and individual streaks of light that flash across the sky every night are generated when tiny flecks of celestial detritus, often no larger than grains of sand or of pebbles, burn up speeding through the atmosphere.

(A) grains of sand or of pebbles, burn up speeding
(B) grains of sand or pebbles, burn up while speeding
(C) grains of sand or pebbles, which burn up while speeding
(D) a grain of sand or pebble, which burns up as it speeds
(E) a grain of sand or a pebble burns up when it speeds

OA.B
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