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    I'm not sure ________that's a good idea.


    1. A.
      what
    2. B.
      if
    3. C.
      that
    4. D.
      as

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    I’m not sure ______ he will come tomorrow.
    A. that                    B. if                  C. when

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    I’m not sure ______ he will come tomorrow.

    A. that B. if C. when

     

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    I’m not sure ______ he will come tomorrow.
    A. that                    B. if                  C. when

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    I’m not sure ________ it’s a good idea or not.
    [     ]
    A. whether
    B. that      
    C. how    
    D. if

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