单项选择题

You look as if you ______ just ______ a ghost.

A. have; seen
B. had; seen
C. will; see
D. did; see
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单项选择题
The books I bought last year were very valuable. Without them I ______ the examinations.
A. couldn't pass
B. wouldn't pass
C. couldn't have passed
D. won't pass
单项选择题
Kate failed in the examination. She would have passed it if she ______ harder.
A. studied
B. had studied
C. would study
D. has studied
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