请教一道OG的题目

douglas1205 · 发表于 2012-4-10 11:50:22

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
这里为什么要用would，这里的虚拟语气体现在哪里，小弟看不出来啊，请教一下大家。

TSFyfy · 发表于 2012-4-10 11:59:05

我读这题的感觉是:
为了..., 他们需要....

你换成AB读: 为了..., 他们必须...
结合这题说的内容,我读AB觉得别扭.

isisong · 发表于 2012-4-10 15:35:47

我的理解是：
would have to 是不很肯定的语气，表达的是have to 的内容只是一个假设，并不是“必须”
have to 表达的意思是要做的这件事情非常重要，“必须去做”

请教一道OG的题目

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