It had been many years since my wife and I had gone dancing it + 过去完成时 + since +

题目

It had been many years since my wife and I had gone dancing it + 过去完成时 + since +
例句：it + 过去完成时 + since + 过去完成时
为什么不是it + 过去完成时 + since + 过去式?
真的是it + 过去完成时 + since + 过去完成时？我怎么记得老师讲的是it + 过去完成时 + since + 过去式？
那这个句子不是错了？

答案

这些都是语法,是固定用法啊,你记住就行
不好意思,我之前没有指出,是it + 过去完成时 + since + 过去式
你老师对的