At the beginning of class, the noise of
问题:
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
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