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标题: 帮忙GWD-1-Q32 [打印本页]

作者: kennypl 时间: 2006-10-10 22:52
标题: 帮忙GWD-1-Q32

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

怎么会是E呢...WOULD时态不对呀

[此贴子已经被作者于2006-10-11 12:42:38编辑过]

作者: kennypl 时间: 2006-10-11 07:57
顶..怎么没人帮忙啊...求助啊

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