单项选择题

He advised Mary ______ anyone about the shortages.

A. not telling
B. not tell
C. not to tell
D. to not tell
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Though steam engines have now passed the ______ of their usefulness, their heritage remains.
A. prime
B. era
C. epoch
D. date
单项选择题
The supermarket is ______ until 9:30 P. M.
A. opening
B. opened
C. open
D. opens
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