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
Mrs. White bought ______ of meat.
A. a half kilo
B. half kilo

C. half a kilo
单项选择题
The film is ______ interesting ______ I want to see it again.
A. too, to
B. very, that
C. so, that
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