题目内容
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
C。
解析:
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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