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[求助]prep 2#187,请进~

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楼主
发表于 2009-9-16 01:43:00 | 只看该作者

[求助]prep 2#187,请进~

187.       (32525-!-item-!-188;#058&007080)    (GWD-1-Q32)

 

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 economic

 

我选的是A,答案为D,为什么呢,would家在这里是什么意思呢?

沙发
发表于 2009-9-18 21:01:00 | 只看该作者
因为与现实想反,要用虚拟语气WOULD HAVE  TO, THAN 前后要对应平行,加上DO 选D。
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