单项选择题

This is a book ______ sports.

[A] in
B. on
C. for
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单项选择题
When they got to the cinema, the play ______ for half an hour.
A. has begun
B. had begun
C. had been on
单项选择题
Listen! There is ______ at the door.
A. a knocking
B. knock
C. a knock
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