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单项选择题

______ his homework, he went to bed.

A. Doing

B. Having done
C. To do
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热门试题

单项选择题Don’t forget ______ the letter this afternoon.

A. post

B. to post

C. posting

单项选择题I saw the thief ______ into the house.

A. to go

B. went

C. go