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    30．It is not yet well understood has made the rainforest disappear year by year． A．what B．which C．that D．how 【查看更多】

     

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    It is not yet well understood ________ has made the rainforest disappear year by year．


    1. A.
      what
    2. B.
      which
    3. C.
      that
    4. D.
      how

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    It is not yet well understood ________ has made the rainforest disappear year by year．

    [　　]

    A．what

    B．which

    C．that

    D．how

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