单项选择题

The businessman regretted having spent so much time traveling when he （） with his family.

A. should have stayed
B. had stayed
C. was to stay
D. must stay

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单项选择题
Hard （） he tried, he was unable to meet the deadline for the term paper.

A. although
B. as
C. if
D. since
单项选择题
He deserved （） the prize for writing such an amazing short story. I don't understand his not receiving the award.

A. winning
B. having won
C. to win
D. to have won
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