Despite their numerous attempts to do so, scientists have

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Despite their numerous attempts to do so, scientists have [#permalink]

08 Mar 2013, 14:29

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81% (01:33) correct

18% (00:55) wrong

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Despite their numerous attempts to do so, scientists have not been able to sustain a controlled nuclear fusion reaction.
(A)their numerous attempts to do so, scientists have not been able to
(B)their numerous attempts to do it, scientists have not been able to
(C)them numerously attempting to do so, scientists have not been able to
(D)their numerously attempting to do so, scientists cannot
(E)their numerous attempt to do so, scientists were not able to
Need explanation

[Reveal] Spoiler: OA

Last edited by mun23 on 15 Mar 2013, 06:20, edited 1 time in total.

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Re: Despite their numerous attempts to do so, scientists have [#permalink]

08 Mar 2013, 15:57

Despite their numerous attempts to do so, scientists have not been able to sustain a controlled nuclear fusion reaction.

(A)their numerous attempts to do so, scientists have not been able to

Correct

(B)their numerous attempts to do it, scientists have not been able to

It doen't have a clear antecedent

(C)them numerously attempting to do so, scientists have not been able to

attempting is wrong because the right noun is attempts

(D)their numerously attempting to do so, scientists cannot

As C

(E)their numerous attempt to do so, scientists were not able to

attempt is singular and doesn't agree with their

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Senior Manager

Status: struggling with GMAT

Joined: 06 Dec 2012

Posts: 323

Location: Bangladesh

Concentration: Accounting

GMAT Date: 04-06-2013

GPA: 3.65

Followers: 5

Kudos [?]: 27 [0], given: 46

Re: Despite their numerous attempts to do so, scientists have [#permalink]

15 Mar 2013, 06:41

carcass wrote:

Despite their numerous attempts to do so, scientists have not been able to sustain a controlled nuclear fusion reaction.

(A)their numerous attempts to do so, scientists have not been able to

Correct

(B)their numerous attempts to do it, scientists have not been able to

It doen't have a clear antecedent

(C)them numerously attempting to do so, scientists have not been able to

attempting is wrong because the right noun is attempts

(D)their numerously attempting to do so, scientists cannot

As C

(E)their numerous attempt to do so, scientists were not able to

attempt is singular and doesn't agree with their

In option E here past form is used & in option A present perfect form is used.in option E If it was written "their numerous attempts to do so,scientists were not able to
then what would happen?

Re: Despite their numerous attempts to do so, scientists have [#permalink] 15 Mar 2013, 06:41

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Despite their numerous attempts to do so, scientists have

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