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    18．Even though we have made much progress in preventing pollution, yet much . A. is remained to do B. remains to do C. remains to be done D. is remained to be done 【查看更多】

     

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    Even though we have made much progress in preventing pollution, yet much ________．


    1. A.
      is remained to do
    2. B.
      remains to do
    3. C.
      remains to be done
    4. D.
      is remained to be done

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    Even though we have made much progress in preventing pollution, yet much ________．

    [　　]
    A．

    is remained to do

    B．

    remains to do

    C．

    remains to be done

    D．

    is remained to be done

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