the place where 的疑惑

请教老师们：

1)Ten years later, I returned to I had met Jane.

2)Ten years later, I returned to I had met Jane.

3)Ten years later, I returned I had met Jane.

上面3句都正不正确？为何？麻烦老师每一句都剖析一下并讲解一下缘由，很感谢！

1) Ten years later, I returned to I had met Jane.

【正确】 where I had met Jane 是定语从句。 where是关系副词，在从句中作地址状语。

2) Ten years later, I returned to I had met Jane.

【正确】 I had met Jane 是宾语从句，作介词  to 的宾语。

3) Ten years later, I returned I had met Jane.

【正确】where前面的介词  to 可以省略。