单项选择题

Forty percent()stopped smoking in that company.

A. has
B. is
C. have
D. are

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单项选择题

-- You're not a freshman, are you -- (), I am a second-year student.

A. Yes, I'm not
B. No, I am
C. No, I'm not
D. Yes, I am

单项选择题

It is nice to go for a walk() a summer evening.

A. on
B. during
C. in
D. at

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