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问题: 关于不定式

At the beginning of class,the noise of desks_____could be heard outside the classrooms.
A.opened and closed
B.to be opened the closed
C.being opened and closed
D.to open and close
请解释

解答:

在这个题目中动词“open and close”和名词“desks”构成了动宾关系,即“open and close desks”,因此选择非谓语动词要用到被动形式,而前三个含有被动成分的选项又分别有“完了”“将要”和“正在”的含义
因此,能准确表达句子意思的应当是C。