单项选择题

It______last night, because the ground is wet.

A. rain
B. must rain
C. must have rained
D. rained
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I ______my teacher to write a recommend letter for me if I see her.
A. have asked B. ask
C. will ask
D. asked
单项选择题
It has been ten years since she ______ a nurse.
A. is
B. has been
C. was
D. had been
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