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
Whose ______ was it to make up such a seemingly careful plan
A．idea
B．thought
C．purpose
D．dream
单项选择题
The valuable curiosity he bought turns out to be fake for it does not ______ to close examination.
A．put up
B．stand up
C．set up
D．look up
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