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一道英语改错题I have gone to only one football game after I graduat

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一道英语改错题
I have gone to only one football game after I graduated from high school.这题after 和 graduated 都划线了,答案是after改成since,这我能理解,但为什么不能把graduated改成过去完成时呢?
一道英语改错题I have gone to only one football game after I graduat
这个句子是个典型的完成时的句子,Since意思是“自从”用于完成时中引导时间状语.graduate from high schoo 这个动作发生在过去,并且 graduate 的动作不可延续,所以这里只能用 since I graduated from high school.(.自从我高中毕业)