单项选择题

Tom looks so pale today. He ()ill.

A. must be
B. had to be
C. should be
D. shall be

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单项选择题
Forty percent()stopped smoking in that company.

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