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