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2015年GMAT句子改错练习题及详细解析汇总
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
答案解析如下:
(A)have to know a great deal more than now about the social and economic
【错误】 比较结构:本选项使用了比较句式,比较句式的本质是两个平行可比的主谓结构在进行比较,只不过其中之一会发生省略。“demographers have to know a great deal more than now”中“than”的后方连接的是一个省略后仅剩下“now”的主谓结构,由于“than”之前也是一般现在时,所以我们只能认为,“than”后方被省略的主谓结构还原后应完全继承前半句“demographers have to know”,即“demographers have to know a great deal more than(they have to know)now”,意思是“人口学家不得不知道(一般现在时)比他们现在不得不知道的更多”,表意明显不合理。相比之下,(E)中的“they do”则是“they know”
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