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标题: OG12-41 [打印本页]

作者: katie83 时间: 2009-10-24 01:30
标题: OG12-41

41.To develop more accurate population forecasts, demographers have to know a grea deal more than now about the social and economic determinants of fertility.

D would have to know a great deal more than they do now about the social and economic

E would have to know a great deal more than now about the social and economic

请问d 选项中的“they do ” 为什么不能省略阿？是因为前后主语一致但是时态不一致吗？

作者: katie83 时间: 2009-10-29 03:26
ding

作者: aznxjesus 时间: 2009-10-29 03:48

I have more apple than you do.

You can't have "I have mroe apple than do."

"I" compare to "you"

You can't compare "They would have to know" with "Now"

作者: melodyflying 时间: 2009-10-29 14:28

去掉比较对象就变成了已知的知识和一个时间now比了

作者: joyviva 时间: 2009-10-29 16:11
但我想问：为何一定要would have to?而have to本身也没啥问题啊

作者: katie83 时间: 2009-11-1 00:39

谢谢 !! 明白了 ~~

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