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
He is one of the leaders（）to attend the important international conference.

A. who have been invited
B. who has been invited
C. whom they have invited him
D. whom has been invited
单项选择题
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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