单项选择题

Mary told me that the story book must ______ to the library in two days.

A．be return
B．be returned
C．been returned
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单项选择题
We ______ to be here at six o'clock.
A．were told
B．told
C．are told
单项选择题
Hurry up. My mother ______ for us in the zoo.
A．must wait
B．should be waiting
C．must be waiting
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