The noise of the machine _____,can be clealy heard in our classroom

题目

The noise of the machine _____,can be clealy heard in our classroom
A fixed B.being fix C.to be fixed D.having been fixed
正确答案是B.为什么要选现在分词的被动语态?

答案

你能听到,所以它正在修.being fixed正在进行 to be fixed 将要发生
having been fixed 已经修好了