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
He regretted ______ so much time playing the computer games.
A．to waste
B．wasted
C．wasting
D．to be wasted
单项选择题
The teacher congratulated him ______ getting the first prize in the speech contest.
A．at
B．for
C．on
D．with
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