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
Mrs. Yang has twelve students, and she likes the ______ best.
A． twelve
B． twelvth
C． twelfth
单项选择题
Christina lives in a city far away ______ her hometown.
A． off
B． from
C． /
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