单项选择题

All the students are busy with the revision prior to the final exam.

A. during
B. after
C. before
D. for
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单项选择题
They have accomplished their mission successfully.
A. realized
B. designed
C. completed
D. arranged
单项选择题
Doctors strongly recommend that fathers should be present at their baby's birth.
A. comment
B. request
C. suggest
D. demand
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