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考试吧整理“2015年GMAT句子改错练习题及详细解析”更多GMAT改错练习题等，请访问考试吧GMAT考试网！ 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” | 
