关于虚拟语气

glw1900 · 发表于 2011-11-15 23:20:58

To develop more accurate p p p 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 i l d i
(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

这是og的41题，高中的时候学虚拟语气必须是if。。。。，。。。句式才会用虚拟语气，但是这个句子根本没有if，为什么也要用虚拟语气呢，是不是在gmat中很喜欢用虚拟语气呢，还是我对虚拟语气的理解有误呢，请大师指导

glw1900 · 发表于 2011-11-16 13:29:47

求解答呀。。。。。

glw1900 · 发表于 2011-11-17 16:55:06

求解答呀

关于虚拟语气

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