[题目]Every possible means to prevent the air pollution, but the sky is still not clear.A. is used B. are usedC. has been used D. have been used 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】Every possible means __________ to prevent the air pollution, but the sky is still not clear.

A. is used B. are used

C. has been used D. have been used

【答案】C

【解析】句意：各种各样的可能的方法都用来预防空气污染,但至今天空仍不晴朗。means单复数相同,谓语动词用单数还是复数取决于means的修饰词,修饰词为all或those等时,句子谓语动词用复数；为every或each,句子的谓语动词用单数。强调过去动作对现在的影响,用完成时;means由every修饰,句子的谓语动词用单数。综上所述可知选C。

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