单项选择题

–Excuse me，sir.I’m writing a research paper on Chinese culture.Do you mind a few questions？--（）

A.Certainly.
B.By all means.
C.Yes，please.
D.No，of course not.

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单项选择题

—Must I be home before seven？—（）.

A.No，you won’t
B.No，you mustn’t
C.No，you needn’t
D.Yes，you will

单项选择题

In our university，library books （）in two months.

A.will return
B.must be returned
C.return
D.must return

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