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    18．All books must the library on time at the end of term．A．return B．be returned to C．returned to D．be returned 【查看更多】

     

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    All books must _________ the library on time at the end of term．

    A．return        B．be returned to            C．returned to              D．be returned

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    All books must _______ the library on time at the end of term.
    [     ]
    A．return
    B．be returned to
    C．returned to
    D．be returned

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