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[求助]新PREP SC2-187

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楼主
发表于 2009-3-19 17:07:00 | 只看该作者

[求助]新PREP SC2-187

187.
                
(32525-!-item-!-188;#058&007080)     (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.
            

A. have to know a great deal more than now about the social and economic

B. have to know a great deal more than they do now about the social and economical

C. would have to know a great deal more than they do now about the social and economical

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

key: D 

这里为什么要用would呢? would在这里表示什么意思啊?

沙发
发表于 2009-3-19 18:02:00 | 只看该作者
其实我认为是这样的 大家先不看WOULD HAVE TO  和 HAVE TO 的区别,先看 ECONOMIC 与ECONOMICAL 的差别,这里应该用ECONOMIC 所以排除B和C  其次THAN 后面 A和E 选项后面 都没有相应的比较物,所以排除A和E 啦 就剩下D 啦
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