比较句中than后重复主语省略吗？

kuan89 · 发表于 2011-8-12 16:49:25

我看了manhattan里说，比较句里只要不ambiguous可以省略后面相同的主语：
如，P129 I walk as fast now as [I walk] when I was younger. 此处省略I walk
P257 We have even more engines taht are efficient than before. 此处省略we have？

但是 OG12-P704，41题
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

答案选D，并且对于A的解释是wrong comparison between knowledge and time(now)。。

请问是否能省略呢？还是说我说的这两个例子实际上有不同，所以一个能省一个不能？

起源 · 发表于 2011-8-12 16:59:42

我觉得，og上这道题，突破点主要在于确定要不要用Would，因为now已经发生，所以只能用虚拟。我不知这么说是不是正确，很巧，刚刚也在考虑这题。

比较句中than后重复主语省略吗？

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