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    Modern farming methods can have unpleasant effect on environment. A. an; 不填 B. an; the C. 不填; an D. an; an 【查看更多】

     

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    Modern farming methods can have ________ unpleasant effect on ________ environment．


    1. A.
      an；不填
    2. B.
      an; the
    3. C.
      不填；an
    4. D.
      an; an

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    Modern farming methods can have ________ unpleasant effect on ________ environment．

    [　　]
    A．

    an；不填

    B．

    an; the

    C．

    不填；an

    D．

    an; an

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