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    Every possible means ______ to prevent the air pollution, but the sky is still not clear. 

    A．has been used　 B．have been used C．is used　 D．are used 

    A

    解析试题分析：句意：每种可能的方式都被使用过来阻止空气污染，但是天空还是不清楚。Means是单复数同形的单词，因为这里被every修饰，所以means这里是单数，谓语用单数，排除BD，从but the sky is still not clear. 可知这里强调的是已经被使用了，用现在完成时，选A.
    考点：考查主谓一致和时态

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