单项选择题

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 ...

单项选择题To get into the habit of smoking means（）one's own life short.

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