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Every possible means _____ to prevent the air pollution, but the sky is still not clear.
A．is usedB．are usedC．has been usedD．have been used
C

試題分析： 考察主謂一致。本題主語中的名詞means是一個單復數(shù)同形的名詞，要在具體語境中判斷是單數(shù)還是復數(shù)。本句中的形容詞every后面通常要節(jié)單數(shù)名詞，故使用AC，根據句義說明這是已經發(fā)生的事情，故使用現(xiàn)在完成時。句義：每一種可能的方法都已經被使用來預防空氣污染，但是天空仍然不晴朗。故C正確。
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