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    All possible means ____ to prevent the air pollution, but the sky is still not clear.

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

    D

    解析试题分析：句意：所有可能能阻止大气污染的方法都试过了 ，但是空气依然不干净。means单复数同形，在这里是复数,这里强调过去的动作的影响所以用现在完成时更好。故选D。
    考点: 考查动词时态的用法。

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