The telephone had been ringring for there minutes before it was a_英语解答

The telephone had been ringring for there minutes before it was answered.
这个句子是过去完成进行时,求各位老师同学详细讲下,这句话是怎么体现过去完成进行时的

人气：294 ℃　时间：2019-10-23 03:31:39

解答

①表示发生在过去的动作对现在造成的某种影响或结果,用来指定在另一个过去行动之前就已经完成了的一个事件.
在另一个过去行动之前:before it was answered.