题目内容

【题目】Some wild animals are in danger because the number of them smaller

and smaller.

A. become B. are becoming C. is becoming D. have become

【答案】C

【解析】

句意:一些野生动物濒临灭绝,因为他们的数量在变得越来越小。the number of ---的数字,做主语时,谓语动词用单数形式;根据句意可知是正在变得越来越小,用现在进行时态;故选C

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