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    He has some doubt he will succeed in his research work. A. that B. whether C. which D. weather 【查看更多】

     

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     He has some doubt ________ he will succeed in his research work.

    A. whether                   B. weather             C. which        D. that

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    He has some doubt ________ he will succeed in his research work.

    A.  whether                        B.  if             C.  which                           D.  that

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     He has some doubt ________ he will succeed in his research work.

    A. whether           B. weather      C. which        D. that

     

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