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    13．Great measures to prevent the air pollution, but the sky is still not clear. A. is taken B. are taken C. has been taken D. have been taken 【查看更多】

     

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     Great measures ______ to prevent the air pollution, but the sky is still not clear.

    A. is taken                       B. are taken  

    C. has been taken                 D. have been taken

     

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