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    He tried his best to solve the problem, difficult it was. A. however B. no matter C. whatever D. although 【查看更多】

     

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    He tried his best to solve the problem,________ difficult it was.

    A.however             B.no matter

    C.whatever            D.although

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    He tried his best to solve the problem, ______ difficult it was.

       A. however        B. no matter          C. whatever       D. although

     

     

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     He tried his best to solve the problem ,       difficult it was .

    A. however      B. no matter        C. whatever     D. although

     

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    He tried his best to solve the problem, _____ difficult it was .

    [     ]

    A. however
    B. no matter
    C. whatever
    D. although

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    He tried his best to solve the problem, _______ difficult it was.

       A. however              B. no matter                  C. whatever                  D. although

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