it was 3 years before i had graduated from the university 对吗?

问题描述:

it was 3 years before i had graduated from the university 对吗?
也就是it is 过去式 before 过去完成时

如果想说“我大学毕业后已经过了三年”,不能用 before,应该改为 since,即 : it was 3 years (since) I had graduated from the university...