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标题: 求助：gwd-1-32 [打印本页]

作者: bfghdggf 时间: 2005-5-11 06:53 标题: 求助：gwd-1-32

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

为什么不选C呢？

作者: apply1 时间: 2005-5-11 07:01

economic vs. economical

economic 经济学的

economical 节俭的

作者: bfghdggf 时间: 2005-5-13 06:54

why??/

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