Because his experience in the naval medical corps had been rewrding,Bob applied to medical school after he was discharged from the navy.过去完成时不是过去的过去吗?为什么 was discharged 不改成 had been discharged?

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Because his experience in the naval medical corps had been rewrding,Bob applied to medical school after he was discharged from the navy.过去完成时不是过去的过去吗?为什么 was discharged 不改成 had been discharged?
Because his experience in the naval medical corps had been rewrding,Bob applied to medical school after he was discharged from the navy.
过去完成时不是过去的过去吗?为什么 was discharged 不改成 had been discharged?

Because his experience in the naval medical corps had been rewrding,Bob applied to medical school after he was discharged from the navy.过去完成时不是过去的过去吗?为什么 was discharged 不改成 had been discharged?
因为有after

过去的过去是老师为了帮助学生理解而这么解释的

你自己画个时间轴

想这个例子: 截止到昨天,我已经背了10个单词
I had memorized 10 words by yesterday.
到今天为止,我已经背了10个单词
I have memorized 10 words.

完成时强调对现在的影响, 表示 “已经”的意思
而问题里的那句话只是表示单纯的时间点先后,不用完成时,就过去时就可以
真正的交流当中很少用到过去完成时和现在完成进行时