单项选择题

They are going to visit Sydney ______ Christmas.

A. at
B. in
C. for
D. on
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单项选择题
The surgeon was expected to finish the operation ______ noon.
A. in
B. before
C. till
D. on
单项选择题
I should have a reply ______ the next 10 days.
A. for
B. to
C. on
D. within
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