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    精英家教网 > 高中英语 > 题目详情
    Every possible means       to prevent the air pollution, but the sky is not still clear.
    A．is usedB．are usedC．has been usedD．have been used
    C
    考察主谓一致。Means方法，方式；是一个单复数同形的名词，在本句中前面有every修饰，说明means是一个单数名词，故使用单数形式，根据句意可知是已经被使用来预防空气污染，故C正确。
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