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To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
正确的答案是 would have to know a great deal more than they do now about the social and economic
另外一个答案E would have to know a great deal more than now about the social and economic 被OG认为是拿来和now 做比较了,但是白勇的语法里面说,当主句的主谓和比较中的主谓完全相同时可以完全省略主谓,只留下状语
为什么这个答案不可以被认为是省略了they know呢 |
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