问题 选择题

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

答案

C。

由于是用于介词of后作宾语,所以要用动名词,不用不定式或过去分词,故选C。另外,由于desks与open和close的关系是被动关系,故要用动名词的被动式being opened and closed。

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