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大学をでる　VS 大学を卒業する <- any difference between these two sentences? And, use "を” at "大学を卒業する, right?

「大学をでる」- sounds "you were educated in college" . For example:「わたしは　大学をでていません」 means I don't have any experience of learning at college. I only have high school degree."
「大学を卒業する」- is, you finished and leave college.

particle を is correct.

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