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    --Who are the young people gathering at the school gate? --Well, if you know, they are all my visiting students. A. must B. can C. may D. shall 【查看更多】

     

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    --Who are the young people gathering at the school gate?

    --Well, if you _______ know, they are all my visiting students.

    A. must                B. can                C. may                        D. shall

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