单项选择题

You should know better than （）your little sister at home by herself.

A. to leave
B. leaving
C. have left
D. left

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单项选择题
Tom, your book was due yesterday and I would rather you （）the book then.

A. would return
B. should return
C. had returned
D. returned
单项选择题
The millions of calculations involved,（）by hand, would have lost all practical value by the time they were finished.

A. had they been done
B. they had been done
C. having been done
D. they were done
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