单项选择题

It was for some reasons ______ he didn't tell you the truth at that time.

A. which
B. why
C. that
D. so
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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
______the population is too large, the government has to take measures to control the birth rate.
A. Although
B. Since
C. If
D. Until
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