We met again by accident after seventeen years had passed.最后的had passed是什么语法结构

问题描述:

We met again by accident after seventeen years had passed.最后的had passed是什么语法结构
是否应该用had past?
passed是pass的过去分词吗?

“after seventeen years had passed.”作为时间状语从句修饰“We met ”.
“passed”作为“pass”的过去分词,所以不能用“past”.