问题描述：
----Where are you teaching now?
----In a university.But i taught in a high school for 8 years.
后一句为什么用一般过去,而不用现在完成
----In a university.But i taught in a high school for 8 years.
后一句为什么用一般过去,而不用现在完成
问题解答：
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