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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

     

    【答案】

     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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