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标题: Help Gwd-1-32 [打印本页]

作者: FIDELISCARE 时间: 2005-1-10 05:30
标题: Help Gwd-1-32

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

Can you give me some detail explanation for choosing have to or would have to ?

Thank you

作者: joe11 时间: 2005-1-10 08:53

You can find answers here:

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=56794

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