单项选择题

I ______my teacher to write a recommend letter for me if I see her.

A. have asked B. ask
C. will ask
D. asked
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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
单项选择题
I don't swim now, but I ______ when I was a child.
A. used to do
B. used to doing

C. was used to doing
D. was used to do
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