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标题: 求助各位高人为小弟指点GWD0132(抱歉找不到对应在大全上的编号) [打印本页]

作者: mcyuyu 时间: 2005-5-16 07:44
标题: 求助各位高人为小弟指点GWD0132(抱歉找不到对应在大全上的编号)

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 economical

正确答案是啥and为啥？主句是否要加would? 这里的have是不是助动词？比较句than后是否加do？

作者: wanze 时间: 2005-5-16 10:13
d

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