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求I have just been to the station to see her off和I just went

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求I have just been to the station to see her off和I just went to the station to see her off区别?
Have you ever been to the library和Did you ever go to the library的区别呢?
先看翻译吧:
你去过图书馆了吗?和 你去图书馆了吗?
前者是现在完成时态的一般疑问句,后者是一般过去事态的一般疑问句.一般过去事态一般有过去的时间.用法看情况而定