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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单项选择题
Most matter ______ three states: solid, liquid and gas.
A．have
B．has
C．are
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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