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The woodland sub-species were in isolation from contact with

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Manager
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The woodland sub-species were in isolation from contact with [#permalink] New post 05 Mar 2012, 04:14
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

58% (01:47) correct 42% (00:32) wrong based on 24 sessions
The woodland sub-species were in isolation from contact with humans longer than either their marsh cousins or the tree-dwelling sub-species.

A. in isolation from contact with humans longer than
B. isolated from contact with humans longer than
C. in isolation from contact with humans longer than were
D. isolated from contact with humans longer than were
E. in isolation and without contacts with humans longer than

what's wrong with option B.
[Reveal] Spoiler: OA
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Re: Need the solution [#permalink] New post 05 Mar 2012, 06:05
The woodland sub-species were in isolation from contact with humans longer than either their marsh cousins or the tree-dwelling sub-species.

A. in isolation from contact with humans longer than
B. isolated from contact with humans longer than
Here in option B ,it changes the meaning of the sentence.It means the woodland sub-species were isolated from contact with humans longer than they were isolated from contact with their marsh cousins or the tree-dwelling sub-species.
C. in isolation from contact with humans longer than were
D. isolated from contact with humans longer than were
This option clearly states that woodland sub-species were isolated from contact with humans longer than were their marsh cousins or the tree-dwelling sub-species isolated from contact with humans.
E. in isolation and without contacts with humans longer than
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Re: Need the solution [#permalink] New post 05 Mar 2012, 16:16
Isolated from is the correct idiom so A, C and E are out. Between B and D, the usage of "were" correctly compares isolation factor between different species.
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Re: Need the solution [#permalink] New post 06 Mar 2012, 08:10
Putting B in the original sentence we have

The woodland sub-species were isolated from contact with humans longer than either their marsh cousins or the tree-dwelling sub-species.

The above sentence is ambiguous as it can mean two things

1) The woodland sub-species were isolated from contact with humans longer than they were from either their marsh cousins or the tree-dwelling sub-species. - intended meaning

2) The woodland sub-species were isolated from contact with humans longer than either their marsh cousins were isolated from contact with humans or the tree-dwelling sub-species were isolated from contact with humans.

To remove this ambiguity we need the helping/linking verb "were" as is the case in D. (Helping verbs such as was, were, do , have etc are useful in removing ambiguity )

Crick
Re: Need the solution   [#permalink] 06 Mar 2012, 08:10
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