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42. 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
我知道在官方对E的解释是说,造成knowledge和time of knowing(now)的错误比较外
然后我想了一点是,还有没有一个这样的原因:就是,比较动词时,如果要省略第二个动词,需要前后动词的时态一致,但这道题一个是current,一个是conditional,所以不能省略?有没有这样的说法。。。还是说这是我的臆想。。
另外,到底再怎样的情况下,进行比较时可以省略啊??
每次以为弄懂了后,发现做题又错了。。。
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