how i wish i had come here before 为什么用过去完成时?

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• how i wish i had come here before 为什么用过去完成时?
• 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.
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