[求助]一道语法题

josephhan001

The number of mountain gorillas is declining with such rapidity that the population is one-half in the twenty years between a count wade by George Schaller in 1960 and the one made by Dian Fossey in 1980.

(A) with such rapidity that the population is one-half

(B) with such rapidity that the opulation was one-half

(C) so rapidly the population divided in half

(D) so rapidly that the population was halved

(E) in such rapidity that the population is halved

答案是（D), 不太明白，为什么前面是现在进行时，后面是一般过去时？

[此贴子已经被作者于2006-5-30 17:06:39编辑过]

顾风

 in the twenty years between a count wade by George Schaller in 1960 and the one made by Dian Fossey in 1980

这一段应该能说明问题了吧，前面是表示一般状态，后面相当于一个时间段的案例

fiaoyaya

为什么不选D啊,C中没有that啊

[此贴子已经被作者于2006-5-30 16:45:14编辑过]

carolhide

请LZ在发贴前阅读发贴规则，谢谢配合啦。

    

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顾风

对啊，答案应该不是C吧？我记得我做过好几次了，这题。。。

josephhan001

以下是引用顾风在2006-5-30 17:07:00的发言：
对啊，答案应该不是C吧？我记得我做过好几次了，这题。。。

不好意思，答案应该是D。