单项选择题

I will never forget the days ______ we spent together.

A. that
B. where
C. on which
D. how
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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
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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