请对before引导的主从复合句的时态判别?（before在……之前）
说明：before引导的主从复合句,若均表示在过去发生的事情,从句一般用一般过去时,而主句可以用一般过去时,也可以用过去完成时.
例如：Henry visited New York before he left for washington.
He had learned English for 3 years before he came here.
请看那下面两句.请问哪个是正确的?还是两个均正确?（主要是主句时态表达的合理或不合理）请说明理由.
I got there before I met him.
I had gotten there before I met him.