单项选择题

I was very sleepy. I tried ______ my eyes open but I couldn't.

A. keeping
B. having kept
C. to have kept
D. to keep
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单项选择题
______ , they had no chance of winning the war.
A. They fought as bravely
B. As bravely they fought
C. Bravely as they fought
D. As they fought bravely
单项选择题
______ from endless homework on weekends, the students now find their own activities, such as taking a ride together to watch the sunrise.
A. Freed
B. Freeing
C. To free
D. Having freed
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