一道高中英语题，谢谢

Question

At the being of the class the noise of desks __could be heard for over an hour
A.opened and closed B. to be opened and closed C.being opended and closed D.to open and close 答案给的是C，我想知道为什么C对了， A错在哪里

Answer 1

首先，你题目的第3个单词打错了，改为beginning才对。正确的题目是：At the beginning of the class,the noise of the desks being opened and closed could be heard for over an hour.
正确选项是：C.being opened and closed 。
这里的desks是宾格，代替了所有格desks'。the desks' being opened and closed 是动名词（的被动语态）的复合结构，做of的宾语，而the noise of the desks' being opened and closed做句子的主语，意思是，“课桌（的抽屉）被打开和关上（产生的）噪音”。
选项 A.opened and closed 错在不能直接用过去分词，而要用动名词的被动语态，也就是说，这里的being是不能少的。

Answer 2

刚开始上课的时候听见桌子开关的声音。
那个时候声音正在响，所以能听见
A是完成，声音都响完了，还怎么听。。。

Answer 3

正确案应该是：C.being opened and closed 。A.opened and closed 是过去分词作后置定语表“开和关桌子的杂音”已经完成，既然已经完成了，在上课初又怎么能听得见？而C表示“正在开和关桌子的杂音”那当然就听得见了，满意吗？

Answer 4

首先 噪声是被迫停下的并非主动 所以排除AD 不定式表目的 而且凭语感不难排除B

Answer 5

A错在主动语态，B错在将来时，D错在主动语态、将来时