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标题: [求助]prep 2#187，请进～ [打印本页]

作者: 幸福的莹莹 时间: 2009-9-16 01:43
标题: [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？

作者: terry_run 时间: 2009-9-18 21:01
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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