单项选择题

Seldom（）my boss in such a good mood since I came to work in this company.

A. I saw
B. have I seen
C. I have seen
D. do I see

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I haven’t seen my neighbors for over a week. They（）on a trip abroad.

A. may go
B. may have gone
C. must go
D. ought to go
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To get into the habit of smoking means（）one's own life short.

A. make
B. making
C. to make
D. made
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