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