单项选择题

Research findings show that we spend about two hours dreaming every night no matter what we______ dialog the day.

A. should have done
B. would have done
C. may have done
D. must have done
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单项选择题
Operations which left patients ______ and in need of long periods of discovery time now leave them feeling relaxed and comfortable.
A. exhausted
B. unhealthy
C. upset
D. fearful
单项选择题
It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.
A. had leaked

B. is leaking
C. leaked

D. has been leaking
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