这个英语错在哪儿i have been teaching here for 30 years when you graduate from this university

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这个英语错在哪儿i have been teaching here for 30 years when you graduate from this university
这个英语错在哪儿
i have been teaching here for 30 years when you graduate from this university

这个英语错在哪儿i have been teaching here for 30 years when you graduate from this university
i have been teaching here for 30 years before you graduate from this university