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I enjoyed English ,biologymand chemistry at school,but which

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I enjoyed English ,biologymand chemistry at school,but which one should I choose to study at university?I did not know the answer until obe evening when I sat down at the computer to do some research on great women of China
请分析这一段(有什么从句?时态?固定搭配等等)
I enjoyed English ,biologymand chemistry at school,but which
固定搭配:at +school; research+in/into/on not...until...
从句:时间状语从句 when I sat down.China.
时态:一般过去时.