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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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