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题目
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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

答案
C
解析
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。
核心考点
试题【Every possible means       to prevent the air pollution, but the sky is not stil】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
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