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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 

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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

 

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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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