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

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考题讲解

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)。

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