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Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

A. has been used B. have been usedC. is used D. are used

 

A

【解析】

试题分析:句意:每种可能的方式都被使用过来阻止空气污染,但是天空还是不清楚。Means是单复数同形的单词,因为这里被every修饰,所以means这里是单数,谓语用单数,排除BD,从but the sky is still not clear. 可知这里强调的是已经被使用了,用现在完成时,选A.

考点:考查主谓一致和时态

 

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