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

     

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    －Who are the teenagers gathering at the school gate?

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

    A. shall　　B. can　　C. may　　D. must

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    －Who are the teenagers gathering at the school gate?

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

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

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