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Scientists have recently analyzed glass spherules that were created by

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Scientists have recently analyzed glass spherules that were created by  [#permalink]

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New post 16 May 2017, 12:08
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A
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Question Stats:

55% (01:21) correct 45% (01:32) wrong based on 274 sessions

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Scientists have recently analyzed glass spherules that were created by the meteor impact near the Yucatan Peninsula in Mexico and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.

(A) and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.
(B) but have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.
(C) having concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.
(D) and have concluded that the infamous meteor arrived 300,000 years too early to kill the dinosaurs.
(E) and concludes that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.

Source: GMAT For Dummies
Difficulty Level: 700

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Re: Scientists have recently analyzed glass spherules that were created by  [#permalink]

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New post 16 May 2017, 12:23
SajjadAhmad wrote:
Scientists have recently analyzed glass spherules that were created by the meteor impact near the Yucatan Peninsula in Mexico and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.

(A) and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.
(B) but have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.
(C) having concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.
(D) and have concluded that the infamous meteor arrived 300,000 years too early to kill the dinosaurs.
(E) and concludes that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.

Source: GMAT For Dummies


The sentence is correct as is. hence Option A

(A) and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.------->Correct
(B) but have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.------->"but" is incorrect here. it represents contrast
(C) having concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.------->"having" is incorrect. It modifies immediate noun
(D) and have concluded that the infamous meteor arrived 300,000 years too early to kill the dinosaurs.------->"to kill the dinosaurs." is illogical
(E) and concludes that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs."Concludes" Simple present is incorrect here.
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Re: Scientists have recently analyzed glass spherules that were created by  [#permalink]

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New post 17 May 2017, 05:14
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1
Scientists have recently analyzed glass spherules that were created by the meteor impact near the Yucatan Peninsula in Mexico and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.

(A) and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. (Correct)
(B) but have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. (Sentence does not show contrast)
(C) having concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. (Scientists have analyzed something after concluding the event. Both events are separate)
(D) and have concluded that the infamous meteor arrived 300,000 years too early to kill the dinosaurs. (To correctly show the past event, perfect tense should be used)
(E) and concludes that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. (The second part of the sentence should also be in perfect form)

Kudos please if you like my explanation!
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Re: Scientists have recently analyzed glass spherules that were created by  [#permalink]

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New post 25 Jul 2017, 07:52
we need and have concluded.
right away, only A and D remain.
to have killed - properly relates a cause-effect relation.
A
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Re: Scientists have recently analyzed glass spherules that were created by  [#permalink]

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New post 06 Aug 2019, 03:40
2
Scientists have recently analyzed glass spherules that were created by the meteor impact near the Yucatan Peninsula in Mexico and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs.

(A) and have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. - Nothing seems wrong. So we will review other options.
(B) but have concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. - there is no need for "but" in the sentence since there is no contrast
(C) having concluded that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. - not parallel
(D) and have concluded that the infamous meteor arrived 300,000 years too early to kill the dinosaurs. - the meaning is changed. It seems as if the meteor came 300,000 years early especially to kill dinosaurs.
(E) and concludes that the infamous meteor arrived 300,000 years too early to have killed the dinosaurs. - and concludes is not parallel

So the answer is A
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Scientists have recently analyzed glass spherules that were created by  [#permalink]

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New post 27 Aug 2019, 09:44
Between Option A and Option D, Option A is better because of the following reasoning.

Option A can be re-written as :

Scientists have recently analyzed glass spherules that were created by the meteor impact near the Yucatan Peninsula in Mexico and have concluded that the infamous meteor arrived 300,000 years too early to have the dinosaurs killed.

Unlike Option A, Option D implies that the meteors arrival happened to kill the dinosaurs. However, it was just an effect of the arrival that killed the dinosaurs. To make it clearer, we may refer to below two versions of a sentence:

1. The City's mayor awarded the CEO of Infrotraction, a budding EPC industry, for building the city's major highway.
2. The City's mayor awarded the CEO of Infrotraction, a budding EPC industry, for having built the city's major highway.

Here, the second sentence is better for the same reason that the CEO himself did not build the highways but got it built from others in the company.
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Scientists have recently analyzed glass spherules that were created by   [#permalink] 27 Aug 2019, 09:44
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