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问题: 英语题,急!

1.At the beginning of class,the noise of desk
( )could be heard outside the classroom.
A.opened of and closed
B.to be opened and closed
C.being opened and closed
D.to open and close
选C,帮我解析一下.而且说说明另外的为什么错.

解答:

C主要是强调动作正在进行。因为只有桌子正在弄出的噪音才可以被听到,因此用doing.同时,桌子是被开关的,所以用被动。加在一起就是现在分词的被动语态。即doing变成being done