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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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
单项选择题
He demanded that I ______ the question at once.
A. answer
B. would answer
C. answered
D. had answered
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