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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The teacher congratulated him ______ getting the first prize in the speech contest.
A. at
B. for
C. on
D. with
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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