Rock samples taken from the remains of an asteroid about : GMAT Sentence Correction (SC)
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# Rock samples taken from the remains of an asteroid about

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Rock samples taken from the remains of an asteroid about [#permalink]

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06 May 2012, 09:55
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Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are
[Reveal] Spoiler: OA

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Last edited by Nevernevergiveup on 12 Nov 2016, 09:02, edited 1 time in total.
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Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are ANSWER

The subject 'rock samples' is plural so both the verb after 'dinosaurs', 'have', and the verb before 'evidence', 'are', have to be plural.

The correct idiom is 'dated at.'

Hope that helps .
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17 Sep 2013, 05:58
easy breezy.. idiom usage. DATED AT and not dated to be.. therefore A, C and D out. Out of B and E , B uses HAS whereas samples-the subject is plural
There fore E is best.
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Re: Rock samples taken from the remains of an asteroid about [#permalink]

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18 Sep 2013, 00:58
dvinoth86 wrote:
sravanth wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

(A) has been dated to be 3.47 billion years old and thus is
(B) has been dated at 3.47 billion years old and thus
(C) have been dated to be 3.47 billion years old and thus are
(D) have been dated as being 3.47 billion years old and thus
(E) have been dated at 3.47 billion years old and thus are

Rock samples ---> plural subject. hence has been is incorrect and have been in correct.
Eliminate A and B.

Dated at is the correct idiom. hence E.

Removing all the flabs i.e. here is the main sentence.

Rock samples ....[taken from the remains of an asteroid about twice the size of the 6-mile-wide asteroid tha......]has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth

Rock samples is plural subject hence , 'Have' & 'are' required, dated to be - incorrect idiom usage.
Hence A, B eliminated
C Dated to be is wron indiom
D verb is missing

E - corrects Sub- verb agreement error and Idiom usage

Concept tested : SVA, IDIOM
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26 Sep 2013, 09:42
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05 Jan 2014, 10:47
Clearly, the ideom "dated AT" messed with me, for me it seems as if the dating of rock samples are happening AT some location when we use "dated AT".. Apparently though, it is the correct ideomatic usage and thus I stand corrected. (I picked C)
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06 Jan 2014, 03:57
Appreciate if anybody can please suggest me the source of most comprehensive Idiom list.
Somehow I have got lot of lists but not sure which one is best suited

Thanks
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06 Jan 2014, 04:42
ardhenduchasing wrote:
Appreciate if anybody can please suggest me the source of most comprehensive Idiom list.
Somehow I have got lot of lists but not sure which one is best suited

Thanks

GMAC has moved away from testing SC solely on the basis of idioms. But still, you can go through the lists (no harm)

Please complete the below one and then proceed to others.

http://magoosh.com/gmat/2013/gmat-idiom-ebook/

gmat-idioms-comprehensive-list-of-gmat-idioms-80342.html
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13 Jul 2014, 22:55
Rock samples -subject so have

"dated at" is correct idiom so E is good
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14 Jul 2014, 01:29
The correct idiom is 'dated at.
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Rock samples taken from the remains of an asteroid about [#permalink]

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04 Dec 2014, 12:12

I am very confused on the usage of the idiom DATED AT vs DATED TO BE,

Although, i thought that DATED AT was prefered on the Gmat, I've seen both of them as right answer !!!(see link from gmatprep test2 qn 2)
I am a non native and it confuses me,
Is there a tip to choose correctly beetween the two ?
Do you have any link to an discussion, expert explanation, or else on that ?

Thank you very much !
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01 Mar 2015, 22:59
Dated at is the correct idiom.

Wish dated at was replaced with estimated to be...
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18 Mar 2015, 12:32
OG explanation for choice C says: ' the conjunction and thus should be followed by a verb'.

I am wondering why do we necessarily need a verb after 'and thus'. Can't we think of 'have been' as the verb of the 'and thus'?!

... have been dated at ... and thus [have been: implied] evidence

Is there also a tense problem?
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19 Mar 2015, 02:43
apolo wrote:
OG explanation for choice C says: ' the conjunction and thus should be followed by a verb'.

I think you are referring to choice B, because choice C already has a verb "are" after "thus"

Quote:
I am wondering why do we necessarily need a verb after 'and thus'. Can't we think of 'have been' as the verb of the 'and thus'?!

... have been dated at ... and thus [have been: implied] evidence

Is there also a tense problem?

Yes, I believe that in that case there would indeed be a tense problem, because we need to use "simple present", since this is applicable even now, because these "rock samples" still "are" evidence of the earliest known asteroid impact on Earth.
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19 Mar 2015, 03:30
VerbalHow wrote:
apolo wrote:
OG explanation for choice C says: ' the conjunction and thus should be followed by a verb'.

I think you are referring to choice B, because choice C already has a verb "are" after "thus"

Quote:
I am wondering why do we necessarily need a verb after 'and thus'. Can't we think of 'have been' as the verb of the 'and thus'?!

... have been dated at ... and thus [have been: implied] evidence

Is there also a tense problem?

Yes, I believe that in that case there would indeed be a tense problem, because we need to use "simple present", since this is applicable even now, because these "rock samples" still "are" evidence of the earliest known asteroid impact on Earth.

Sorry. Actually I am referring to Choice D, which has the plural verb.

Apart from tense problem, OG says that we need a verb. But why 'have been' can not perform as the verb for this part? Perhaps because then the whole verb ' have been dated' should be the implied verb for the second part.
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19 Mar 2015, 05:24
apolo wrote:
Sorry. Actually I am referring to Choice D, which has the plural verb.

Apart from tense problem, OG says that we need a verb. But why 'have been' can not perform as the verb for this part? Perhaps because then the whole verb ' have been dated' should be the implied verb for the second part.

Same thing. "have been evidence" would be present perfect and incorrect here. It should be simple present ("are").
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19 Mar 2015, 07:17
VerbalHow wrote:
apolo wrote:
Sorry. Actually I am referring to Choice D, which has the plural verb.

Apart from tense problem, OG says that we need a verb. But why 'have been' can not perform as the verb for this part? Perhaps because then the whole verb ' have been dated' should be the implied verb for the second part.

Same thing. "have been evidence" would be present perfect and incorrect here. It should be simple present ("are").

Yes, but contrary to what you say, OG explanation does not say that we have a tense problem in choice D; it says that we do not essentially have a verb for 'evidence'.
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19 Mar 2015, 08:02
apolo wrote:
Yes, but contrary to what you say, OG explanation does not say that we have a tense problem in choice D; it says that we do not essentially have a verb for 'evidence'.

We must come to terms with the fact that OG explanations are not "very descriptive" (perhaps by intent).

So, when OG says very is "missing", what it perhaps means is that there is not "proper verb" ("are"); I mean if we "assume" the presence of "have been evidence", then the sentence is anyway incorrect (from a "tense" angle).

So, in the present form of the sentence, there really is "no" verb present. I don't see anything "contrary" in this.
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19 Mar 2015, 11:05
VerbalHow wrote:
apolo wrote:
Yes, but contrary to what you say, OG explanation does not say that we have a tense problem in choice D; it says that we do not essentially have a verb for 'evidence'.

We must come to terms with the fact that OG explanations are not "very descriptive" (perhaps by intent).

So, when OG says very is "missing", what it perhaps means is that there is not "proper verb" ("are"); I mean if we "assume" the presence of "have been evidence", then the sentence is anyway incorrect (from a "tense" angle).

So, in the present form of the sentence, there really is "no" verb present. I don't see anything "contrary" in this.

Suppose that instead of 'thus is evidence of the earliest known asteroid impact on Earth', we had 'my toys for several days'.

Do you think that then, choice D would be correct, ignoring the idiom used?

1. Yes. 'Have been' can be the understood verb of the second part: 'and [have been] my toys for several days.'
2. No. 'Have been dated' is the verb of the first part and hence we have: 'and [have been dated] my toys for several days', which does not make sense.

I am wondering which view is correct?!
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19 Mar 2015, 21:21
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apolo wrote:
1. Yes. 'Have been' can be the understood verb of the second part: 'and [have been] my toys for several days.'
2. No. 'Have been dated' is the verb of the first part and hence we have: 'and [have been dated] my toys for several days', which does not make sense.

My understanding is that we cannot interpret it in the second way, but we can wait for expert comments on this.
Re: Rock samples taken from the remains of an asteroid about   [#permalink] 19 Mar 2015, 21:21

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