单项选择题
A. I saw B. have I seen C. I have seen D. do I see
I haven’t seen my neighbors for over a week. They（）on a...
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
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
