单项选择题

The surgeon was expected to finish the operation ______ noon.

A. in
B. before
C. till
D. on
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单项选择题
I should have a reply ______ the next 10 days.
A. for
B. to
C. on
D. within
单项选择题
Judging from the latest information, you’d better make up your mind now ______ it is too late.
A. after
B. since
C. when
D. before
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