At the beginning of class, the noise of
题型:选择题
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