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标题: OG 12 41 [打印本页]

作者: suomiting 时间: 2009-9-4 02:17
标题: OG 12 41

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 hav 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 economic

D correct. Why not A?

[此贴子已经被作者于2009/9/4 2:18:17编辑过]

作者: terry_run 时间: 2009-9-4 02:35

sb know more than "now"

or sb know more than "they do" now

Understand the difference and you will know the answer...

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