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    Even the top students in our class can’t work out this problem. So it be very difficult. A. can B. may C. must D. need 【查看更多】

     

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    Even the top students in our class can't work out this problem. So it _____ be very difficult.  
    [     ]
    A. need
    B. may
    C. can
    D. must

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    Even the top students in our class can't work out this problem. So it ________be very difficult.

    A. may

    B. must

    C. can

    D. need

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    Even the top students in our class can't work out this problem，so it________be very difficult．


    1. A.
      may
    2. B.
      must
    3. C.
      can
    4. D.
      need

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