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Xenoarchaeologist Percival Crawford holds that many historical

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Status: To infinity and beyond
Joined: 26 Sep 2017
Posts: 116

Kudos [?]: 33 [1], given: 24

Location: India
Concentration: Finance, Technology
GMAT 1: 660 Q50 V30
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Xenoarchaeologist Percival Crawford holds that many historical [#permalink]

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Question Stats:

60% (00:59) correct 40% (00:58) wrong based on 134 sessions

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Xenoarchaeologist Percival Crawford holds that many historical monuments were constructed by alien billions of years ago and it has been conducting scientific experiments on the human race ever since.

A. many historical monuments were constructed by alien billions of years ago and it has been
B. many historical monuments are constructed by alien billions of years ago and they has been
C. aliens have constructed many historical monuments billions of years ago and they have been
D. aliens constructed many historical monuments billions of years ago and have been
E. the construction of many historical monuments were by aliens billions of years ago for

Source: CrackVerbal
[Reveal] Spoiler: OA

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Last edited by broall on 30 Sep 2017, 01:30, edited 2 times in total.
Reformatted question

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Re: Xenoarchaeologist Percival Crawford holds that many historical [#permalink]

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New post 09 Dec 2017, 06:08
Xenoarchaeologist Percival Crawford holds that many historical monuments were constructed by alien billions of years ago and it has been conducting scientific experiments on the human race ever since.

A. many historical monuments were constructed by alien billions of years ago and it has been
B. many historical monuments are constructed by alien billions of years ago and they has been
C. aliens have constructed many historical monuments billions of years ago and they have been
D. aliens constructed many historical monuments billions of years ago and have been
E. the construction of many historical monuments were by aliens billions of years ago for

Was hesitant between C and D

Originally I picked C b/c there is a parallelism between have constructed and have been but D would have been the correct verb sequence.

For D, the aliens has finished constructing the monuments as shown by "many historical monuments billions of years ago", therefore, the finished action would be in past tense. The second clause would be present perfect since the aliens are still searching for human race as shown by "ever since."

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Xenoarchaeologist Percival Crawford holds that many historical [#permalink]

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New post 09 Dec 2017, 07:28
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Xenoarchaeologist Percival Crawford holds that many historical monuments were constructed by alien billions of years ago and it has been conducting scientific experiments on the human race ever since.

A. many historical monuments were constructed by alien billions of years ago and it has been - incorrect sentence structure, there should be a comma before 'and'.
B. many historical monuments are constructed by alien billions of years ago and they has been - SV and pronoun error.
C.aliens have constructed many historical monuments billions of years ago and they have been - wrong tense - should be past tense
D. aliens constructed many historical monuments billions of years ago and have been - correct
E. the construction of many historical monuments were by aliens billions of years ago for - meaningless

Kudos [?]: 13 [1], given: 43

Xenoarchaeologist Percival Crawford holds that many historical   [#permalink] 09 Dec 2017, 07:28
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Xenoarchaeologist Percival Crawford holds that many historical

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