单项选择题

"Our Math teacher must be in his office now." "No, he ______ be there. I saw him in the library a minute ago."

A．can't
B．couldn't
C．mustn't
D．wouldn't
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单项选择题
If the company ______in that way for much longer, it will end up in the bankruptcy court.
A．carries out
B．carries on
C．carries away
D．carries off
单项选择题
The valuable curiosity he bought turns out to be fake for it does not ______ ciose examination.
A．pat up
B．stand up
C．set up
D．look up
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