.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 |
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.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 |