单项选择题

If the whole operation （） beforehand, a great deal of time and money would have been lost.

A. was not planned
B. has not been planned
C. had not been planned
D. were not planned

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单项选择题
（） that you were out, I wouldn’t have bothered to come all the way at that time of night.

A. If I should know
B. If I know
C. Had I known
D. Were I to know
单项选择题
The winter vacation （） over, he got down to his work again.

A. was
B. were
C. had been
D. being
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