单项选择题

At the moment the machine（）at full speed.

A. ran
B. was running
C. had been running D. had run

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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
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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