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SC - parallelism

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aanchalsinha
 Post subject: SC - parallelism
 Post Posted: Thu Jul 14, 2011 5:19 am 
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Students


Posts: 15
Hi could someone please explain why answer B is the correct choice? I can't seem to understand why we need the 'do' at the end.

Thanks

Hand ale pumps may slightly improve the flavor of ale over gas-powered kegs, but modern pub managers contend that hand ale pumps cost twice as much as gas-powered kegs.

A. hand ale pumps cost twice as much as gas-powered kegs.
B. hand ale pumps cost twice as much as gas-powered kegs do.
C. maintaining hand ale pumps costs twice as much as gas-powered kegs do.
D. maintaining hand ale pumps costs twice as much as it does for gas-powered kegs.
E. to maintain hand ale pumps costs twice as much as for gas-powered kegs.
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srihariom
 Post subject: Re: SC - parallelism
 Post Posted: Thu Jul 14, 2011 1:17 pm 
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Students


Posts: 3
Hi,

Choice A is comparing the cost of ale pumps to gas powered kegs
whereas

Choice B correctly compares the cost of ale pumps to the cost of gas powered kegs.

Ron,
Can you please correct me if i'm wrong.
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jnelson0612
 Post subject: Re: SC - parallelism
 Post Posted: Sun Aug 07, 2011 5:02 pm 
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ManhattanGMAT Staff


Posts: 1857
What is the original source for this question?

Actually, the reason is that we are using the comparison word "as". "As" is used to compare clauses, which consist of a noun and a tensed verb. So we need to say
hand ale pumps cost twice as much as gas-powered kegs do. (I have bolded the subject and verb)

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Jamie Nelson
ManhattanGMAT Instructor
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aanchalsinha
 Post subject: Re: SC - parallelism
 Post Posted: Thu Aug 25, 2011 7:35 pm 
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Students


Posts: 15
I practiced number of these comparisons questions and its pretty obvious to me now that 'do' is required at the end.

Thank you for responding. Source of this question is 800score.com
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jnelson0612
 Post subject: Re: SC - parallelism
 Post Posted: Sun Oct 02, 2011 9:05 pm 
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ManhattanGMAT Staff


Posts: 1857
Thanks!

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Jamie Nelson
ManhattanGMAT Instructor
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