单项选择题

I didn't finish my homework ______ 12 o'clock last night.

A．at
B．until
C．before
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单项选择题
Christina lives in a city far away ______ her hometown.
A．off
B．from
C．/
单项选择题
The government has ______ a group to deal with the problem.
A．set
B．set up
C．set out
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