题目内容
At the beginning of class, the noise of desks______could be heard outside the classroom.
A.opened and closed B.to be opened and closed
C.being opened and closed D.to open and close
C
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题目内容
At the beginning of class, the noise of desks______could be heard outside the classroom.
A.opened and closed B.to be opened and closed
C.being opened and closed D.to open and close
C