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she went home after she had typed the letter为什么用had而不是has,这儿

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she went home after she had typed the letter为什么用had而不是has,这儿是第三人称啊?
句子来源于新概念120课,课后习题A.例句
she went home after she had typed the letter为什么用had而不是has,这儿
she went home 是主句 after she had typed the letter 是表示时间状态,所以.
通俗点说,主句里面是过去式,那么修饰主句的句子也用过去式、过去完成时,过去将来时等过去时态.过去时态没有第三人称.都是had
还有什么需要解释的吗