At the beginning of class, the noise of desks could be heard outside the classroom. A. op

发布时间：2020-08-14 23:33:20

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

网友回答

A. opened and closed
B. to be opened and closed
(答案→)C. being opened and closed
D. to open and close
解析：此处表示被动和进行，故答案为C，现在分词的被动语态做定语。
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