单项选择题

Smoking is not allowed here ______ .

A．at any time
B．at one time
C．at a time
D．at times
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单项选择题
The teacher went into the classroom, ______ .
A．with book in hand
B．a book in hand
C．with a book in hand
D．book in hand
单项选择题
You must have seen a lot of interesting movies, ______
A．don't you
B．did you
C．must you
D．haven't you
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