Every possible means to prevent the air pollution.but the sky is still not clear．( )A．are being usedB．have been usedC．had been usedD．has been used 题目和参考答案——青夏教育精英家教网—

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17．Every possible means _______to prevent the air pollution，but the sky is still not clear．（　　）

A．

are being used

B．

have been used

C．

had been used

D．

has been used

分析每一种方法都用了来阻止空气的污染，但是填空仍然不干净．

解答答案是D．考查被动语态，means当名词解释为"方法"，单复数同型，这里有every，说明这里的means为单数，means与动词use之间是被动关系，根据语境所有的方法都用了，应该用完成时，所以答案选D．

点评被动语态由"助动词be+及物动词的过去分词"构成．被动语态的时态变化只改变be的形式，过去分词部分不变．疑问式和否定式的变化也如此．掌握各种时态的被动语态是解题的关键．

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