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
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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
单项选择题
John hasn' t got a car yet. If he ______ one, he would go to the beach every Sunday.
A. has
B. will has
C. could have
D. had
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