At the beginning of class,the noise of desks _______ could b

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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
这题选什么?为什么

c.对么?
首先是被动嘛、、At the beginning of class是上课的开始那个点嘛、、、就是ing形式的咯~being咯

At the beginning of class,the noise of desks _______ could b at the beginning of class ,the noise of desks [-A72] At the beginning of class ,the noise of desks ______ 英语5道单项选择1.At the bedinning of class,the noise of desks could 非谓语动词 At the beginning of the class,the noise of at the beginning of class,the noise of desks__could be heard At the begining of class,the noise of desks___ could be hear The teacher handed _____books at the beginning of the class. In the distance ,I could hear the noise of desks ___(open) a 英语翻译1.The noise of desks being opend and closed could be hea at the beginning of 造句是at the beginning of 还是at beginning of