单项选择题

Though steam engines have now passed the ______ of their usefulness, their heritage remains.

A. prime
B. era
C. epoch
D. date
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The supermarket is ______ until 9:30 P. M.
A. opening
B. opened
C. open
D. opens
单项选择题
I was very much put __________ by Mark's rude behavior; it really annoyed me.
A. over
B. off
C. up
D. by
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