单项选择题

Most matter ______ three states: solid, liquid and gas.

A．have
B．has
C．are
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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
单项选择题
--Why do you go to work on foot ______ That doesn't seem to save your time. --To get more exercise and keep healthy.
A．all the time
B．at times
C．from time to time
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