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题库 / Prep2008E2-SC-187
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
have to know a great deal more than now about the social and economic
have to know a great deal more than they do now about the social and economical
would have to know a great deal more than they do now about the social and economical
would have to know a great deal more than they do now about the social and economic
would have to know a great deal more than now about the social and economic
题目分析：
本题具有比较词more…than…。
选项分析：
A选项：比较对象不正确，我们应该比较的是不同时间的两件事，而不是两个时间（now）。
B选项：economic和economical的意思不同，前者是“经济”的意思，后者是“节约的”意思，在逻辑上，和“社会(social)”产生并列关系的应该是“经济”，而不是“节约的”。
C选项：economic和economical错误同(B)。
D选项：Correct. 本选项在语法和逻辑上均是正确的。
E选项：比较对象不正确错误同(A)。
——句意——
1）比较错误
D：would 【have to know】 a great deal more than 【they do now】 about the social and economic，比较对象为【不同时间下的两件事】✔
E：would 【have to know】 a great deal more than 【now】 about the social and economic，比较对象为时间❌
由于前句没有时间状语，后句只能被理解成为【now】，而并不能理解为【省略了谓语动词】
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