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

正确答案: D

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GWD-1-Q32 题外话

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楼主
发表于 2009-7-4 14:31:00 | 只看该作者

GWD-1-Q32 题外话

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

  1. have to know a great deal more than now about the social and economic
                
  2. have to know a great deal more than they do now about the social and economical
                
  3. would have to know a great deal more than they do now about the social and economical
                
  4. would have to know a great deal more than they do now about the social and economic
                
  5. would have to know a great deal more than now about the social and economical

D is the correct answer

答案本身没问题,只是题外话想问一下,如果E改成 would have to know a great deal more than now about the social and economic,E是不是也正确。在下对于比较的省略这块语法点还不是很扎实,望NN指点。
沙发
发表于 2009-7-20 15:09:00 | 只看该作者

un-NN

又看了下前人的解答,说得很清楚.

主要看比较的两个动作,一个是将来时,一个是现在,时态不一样,所以不能省的.

所以E错的不光是这个economic


[此贴子已经被作者于2009/7/20 15:14:06编辑过]
板凳
发表于 2009-9-7 22:29:00 | 只看该作者
有一个疑问,将来时为什么用would?不应该用will吗?
地板
发表于 2009-9-7 22:36:00 | 只看该作者
这题讨论的帖子老多了,真是一言难尽...楼主搜搜去吧,里面有说关于省略的问题
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