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    It is pretty well understood controls the flow of carbon dioxide in and out the atmosphere today. A. that B. when C. what D. how 【查看更多】

     

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    It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.

    A.that        B.when             C.what                   D.how 

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    It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.

    A.that                  B.when             C.what                D.how 

    查看答案和解析>>

    It is pretty well understood __________controls the flow of carbon dioxide in and out the atmosphere today.

    A.that                  B.when             C.what                D.how 

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    It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.

    A. that　　　　　　　　　　 B. when

    C. what　　　　　　　　　　 D. how

     

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    It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today．


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

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