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____ the 1990s, the number of antelopes ...

____ the 1990s, the number of antelopes had fallen to about 50,000.

A. During                     B. Since                                 C. By                             D. Over

 

C 【解析】 试题分析:句意,到二十世纪的九十年代之前,羚羊的数量已经降到了50,000只。During在……期间 Since自从 By到某时间之前 Over在……期间,这个句子用的是过去完成时,故用By。 考点:考查词汇的辨析
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