问一道今年全国高考英语卷的选择题

12. 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

为什么不是A呢?

完整的句子不是应该是
At the beginning of class, the noise of desks (which is)opened and closed could be heard outside the classroom.

吗?然后把which is省略,用过去分词形式表被动啊.

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