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Every possible means ________ to prevent...

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

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

 

D 【解析】 考查主谓一致和动词时态语态。句意:所有可能的方法都被用来防止空气污染,但天空仍然不明朗。means当名词解释为"方法",单复数同型,且every+主语,谓语动词用单数;means与动词use之间是被动关系,根据语境“所有的方法都用了”,应该用现在完成时的被动语态。故选D。
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