The rapid-rail lines that were recently introduced in : GMAT Sentence Correction (SC)
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# The rapid-rail lines that were recently introduced in

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Manager
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The rapid-rail lines that were recently introduced in [#permalink]

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20 Jul 2011, 17:45
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The rapid-rail lines that were recently introduced in southern California have had positive effects: not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.

A. not only have they lowered pollution levels, they have helped in decongesting
B. the lines have not only lowered pollution levels, but also helped to decongest
C. not only have pollution levels been lowered, but they have helped to decongest
D. lines have lowered pollution levels, as well as helped in decongesting
E. not only have they lowered pollution levels, but also have they helped decongest
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Re: SC - 700 level - Rapid-rail [#permalink]

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20 Jul 2011, 18:19
B.

A, C are out because of incorrect use of idiom. D changes the meaning.
of B and E, B is better. In E, 'also have they helped' is awkward construction.
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Re: SC - 700 level - Rapid-rail [#permalink]

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20 Jul 2011, 18:26
This is a tough one.

B would have been an easy choice if "helped to decongest" were replaced by "helped in decongesting".

A does not look correct because of ambiguous "they": does it refer to rail-lines or to positive effects.

So i am left with D.

Crick
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Re: SC - 700 level - Rapid-rail [#permalink]

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20 Jul 2011, 22:42
B for me.

A and C are out, as idiom "not only..but also" is not followed. E is awkward. Left with B and D. I will go with B, as "the lines" in B clearly refer to the lines mentioned previously in the sentence, whereas in D it is just "lines", which can be ambiguous.

OA??
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Re: SC - 700 level - Rapid-rail [#permalink]

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20 Jul 2011, 22:47
bschool83 wrote:
The rapid-rail lines that were recently introduced in southern California have had positive effects: not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.

A. not only have they lowered pollution levels, they have helped in decongesting
B. the lines have not only lowered pollution levels, but also helped to decongest
C. not only have pollution levels been lowered, but they have helped to decongest
D. lines have lowered pollution levels, as well as helped in decongesting
E. not only have they lowered pollution levels, but also have they helped decongest

Can any one explain how is
not only lowered pollution levels parallel to but also helped to decongest
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Re: SC - 700 level - Rapid-rail [#permalink]

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21 Jul 2011, 00:59
sudhir18n wrote:
bschool83 wrote:
The rapid-rail lines that were recently introduced in southern California have had positive effects: not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.

A. not only have they lowered pollution levels, they have helped in decongesting
B. the lines have not only lowered pollution levels, but also helped to decongest
C. not only have pollution levels been lowered, but they have helped to decongest
D. lines have lowered pollution levels, as well as helped in decongesting
E. not only have they lowered pollution levels, but also have they helped decongest

Can any one explain how is
not only lowered pollution levels parallel to but also helped to decongest

hey sudhir
though its quite weird to help you (as you had 0 incorrect in MGMAT)

but still here is my view on this
not only lowered .......xxxxxx || but also helped ..............xxxxx

now xxxxx could be anything
we need not to consider its role in the sentence for us lowered should be "parallel" to "helped"
forget what is ahead in the sentence
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Re: SC - 700 level - Rapid-rail [#permalink]

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21 Jul 2011, 02:44
I choose B.
My explanations are below
bschool83 wrote:
The rapid-rail lines that were recently introduced in southern California have had positive effects: not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.

A. not only have they lowered pollution levels, they have helped in decongesting - incorrect idiom
B. the lines have not only lowered pollution levels, but also helped to decongest - correct idiom
C. not only have pollution levels been lowered, but they have helped to decongest - incorrect idiom
D. lines have lowered pollution levels, as well as helped in decongesting - what lines? we disscust the concret lines so we need "THE lines"
E. not only have they lowered pollution levels, but also have they helped decongest - no subjet makes fragmet
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Re: SC - 700 level - Rapid-rail [#permalink]

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21 Jul 2011, 03:45
WishMasterUA wrote:
I choose B.
My explanations are below
bschool83 wrote:
The rapid-rail lines that were recently introduced in southern California have had positive effects: not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.

A. not only have they lowered pollution levels, they have helped in decongesting - incorrect idiom
B. the lines have not only lowered pollution levels, but also helped to decongest - correct idiom
C. not only have pollution levels been lowered, but they have helped to decongest - incorrect idiom
D. lines have lowered pollution levels, as well as helped in decongesting - what lines? we disscust the concret lines so we need "THE lines"
E. not only have they lowered pollution levels, but also have they helped decongest - no subjet makes fragmet

Can you explain howz that the correct idiom?
Not only X but also Y., both X and Y must be parallel .. are they?
I dont think so they are in B.
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Re: SC - 700 level - Rapid-rail [#permalink]

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21 Jul 2011, 05:51
I think they are.

the lines have not only lowered something, but also helped in something

sudhir18n wrote:
WishMasterUA wrote:
I choose B.
My explanations are below
bschool83 wrote:
The rapid-rail lines that were recently introduced in southern California have had positive effects: not only have they lowered pollution levels, they have helped in decongesting the region's freeway system, which had been operating far above its capacity.

A. not only have they lowered pollution levels, they have helped in decongesting - incorrect idiom
B. the lines have not only lowered pollution levels, but also helped to decongest - correct idiom
C. not only have pollution levels been lowered, but they have helped to decongest - incorrect idiom
D. lines have lowered pollution levels, as well as helped in decongesting - what lines? we disscust the concret lines so we need "THE lines"
E. not only have they lowered pollution levels, but also have they helped decongest - no subjet makes fragmet

Can you explain howz that the correct idiom?
Not only X but also Y., both X and Y must be parallel .. are they?
I dont think so they are in B.
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Re: SC - 700 level - Rapid-rail [#permalink]

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21 Jul 2011, 07:06
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crick20002002 wrote:
This is a tough one.

B would have been an easy choice if "helped to decongest" were replaced by "helped in decongesting".

A does not look correct because of ambiguous "they": does it refer to rail-lines or to positive effects.

So i am left with D.

Crick

Crick,

This is a straight B.

'To help' is a special verb form that can be followed either by a bare infinitive or by a to-form infinitive. It is rarely used in the form Verb + Preposition + gerund. There are very few verbs that are followed by a preposition and a gerund. GMAT almost always prefers the to-form infinitives over the gerund-form.

This is the order GMAT usually prefers in order of correctness:
I helped to raise angel capital >> I helped raise angel capital >> I helped in raising angel capital

Hence, if "helped to decongest" were replaced "with" "helped in decongesting", it would be an incorrect answer choice.

Also a small thing (unrelated to question), the correct idiom usage of replace is 'to replace with' and not 'to replace by'.

Hope it helps.
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Re: SC - 700 level - Rapid-rail [#permalink]

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27 Jul 2011, 13:02
B has correct idiom usage and also its a stand alone sentence unlike D which misses "The" infront of lines.
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Re: SC - 700 level - Rapid-rail [#permalink]

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27 Jul 2011, 21:48
bschool83 wrote:
crick20002002 wrote:
This is a tough one.

B would have been an easy choice if "helped to decongest" were replaced by "helped in decongesting".

A does not look correct because of ambiguous "they": does it refer to rail-lines or to positive effects.

So i am left with D.

Crick

Crick,

This is a straight B.

'To help' is a special verb form that can be followed either by a bare infinitive or by a to-form infinitive. It is rarely used in the form Verb + Preposition + gerund. There are very few verbs that are followed by a preposition and a gerund. GMAT almost always prefers the to-form infinitives over the gerund-form.

This is the order GMAT usually prefers in order of correctness:
I helped to raise angel capital >> I helped raise angel capital >> I helped in raising angel capital

Hence, if "helped to decongest" were replaced "with" "helped in decongesting", it would be an incorrect answer choice.

Also a small thing (unrelated to question), the correct idiom usage of replace is 'to replace with' and not 'to replace by'.

Hope it helps.

Thanks a lot for the explanation !! +1 Kudos !!

Crick
Re: SC - 700 level - Rapid-rail   [#permalink] 27 Jul 2011, 21:48
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# The rapid-rail lines that were recently introduced in

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