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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It is high time that you （） smoking.

A. give up
B. gave up
C. will give up
D. must give up
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I will not lend the book to you （） you can return it in time.

A. in case
B. so that
C. unless
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