单项选择题

It was the old man（）has reported the murder．

A. that
B. which
C. who
D. whom

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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
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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