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

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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
单项选择题
Manufacturing is Canada's most important economic activity, （） 17 percent of the workforce.

A. to engage
B. engages
C. engaging
D. engaged
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