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

A．return
B．be returned to
C．returned to
D．be returned
B
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科目：初中英語 來源：山東省期中題 題型：單選題

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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