单项选择题

I will not lend the book to you （） you can return it in time.

A. in case
B. so that
C. unless
D. if

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单项选择题
No sooner （） arrived at the station than it began to snow.

A. had I
B. I had
C. have I
D. I have
单项选择题
He （） for her for one hour by the time she arrived there.

A. has been waiting
B. has waited
C. had been waiting
D. waited
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