题目内容

Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
A．were usingB．have used
C．has been usedD．was used
C
答案　C　[考查主谓一致及动词时态语态。means意思是“方式”，被every修饰，谓语动词用单数，排除A、B两项；but后的分词用了一般现在时，故此处用现在完成时的被动语态。]
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