To develop more accurate population forecasts, demographers : GMAT Sentence Correction (SC)
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To develop more accurate population forecasts, demographers

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To develop more accurate population forecasts, demographers [#permalink]

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New post 28 Jan 2005, 21:49
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A
B
C
D
E

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To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
A. have to know a great deal more than now about the social and economic
B. have to know a great deal more than they do now about the social and economical
C. would have to know a great deal more than they do now about the social and economical
D. would have to know a great deal more than they do now about the social and economic
E. would have to know a great deal more than now about the social and economical

Explain your answer in detail pl.
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New post 28 Jan 2005, 22:20
Must be "more than they do", so eliminate A, E.

Economical is different from economic in meaning. So eliminate B, C.

(D)
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New post 28 Jan 2005, 23:13
Economic: related to economy
Economical: frugal
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New post 30 Jan 2005, 09:50
The unoffical answer says E. I think it is wrong.
D is the correct answer
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New post 03 May 2005, 11:48
D..social and economic is not the same as social and economical
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New post 04 May 2005, 09:02
MoscowFuturist wrote:
HongHu, what is wrong in A?


wrong comparison.

(A) To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

(D) To develop more accurate population forecasts, demographers would have to know a great deal more than they do now about the social and economic

scrutinize the colored part. Isn't choice D more clear?
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New post 04 May 2005, 15:44
Definitely D. "Economical" is unacceptable. "Would" is desirable, but probably not strictly necessary.

As for what's wrong with A ... could be tough if you're not a native English speaker, because this is rather idiomatic (and native speakers have trouble with it). Here goes:

"Than" used here is a conjuntion, connecting two clauses. It's often used in an elliptical construction, meaning some missing word is implied [see brackets below] It's like a seesaw that must be balanced:

subject verb modifier THAN subject verb [modifier]
I am taller THAN she is [tall]
My car is faster THAN yours is [fast]

Sometimes the 2nd verb is also ellipsed....

My car is faster than yours is fast.
My car is faster than yours.

And so, per (D). Here the word "do" adds a little confusion, but it's just a helping verb for know.

demographers know more THAN they do [know] now


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New post 04 May 2005, 15:49
Welcome to GMATclub supercat. You've been a recent member but I must commend you on your quality posts. Keep it up!
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Paul

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New post 04 May 2005, 21:43
(D) it is .... Two reasons:

'would' and 'than they do now' makes the menaing of the sentence more clearer. They are present in sentence (D) and hence it is right :-)
  [#permalink] 04 May 2005, 21:43
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