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标题: 问题, GWD13套题第一套题Q32 [打印本页]

作者: zijing4546 时间: 2007-5-10 03:31
标题: 问题, GWD13套题第一套题Q32

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

里面要考的语法点都不明白......
1, 啥时候用would have to know
2. 为什么可以用than now
3. economic 和economical有什么区别
请教大家结合这道题给我讲讲,谢谢!

作者: shero 时间: 2007-5-10 12:20

选d

1 一般现在时变过去将来时是表示建议的虚拟语气

2 用than they do now； than now很少可能会对

3 ecomonic经济的经济学的 economical节约的

作者: zijing4546 时间: 2007-5-10 23:00
多谢~~~~~~~~~~~

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