单项选择题

I ______ housework when there was a knock at the door.

A. did
B. was doing
C. am doing
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单项选择题
I ______ what he said is true.
A. trust
B. believe in
C. believe
单项选择题
Did you see them ___________ in the river just now
A. to swim
B. swam
C. swimming
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