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IitfortwoyearswhenIwasatuniversity.为什么是studied而不是完成时hadstudied,havestudied

题目详情
I it for two years when I was at university.
为什么是studied而不是完成时had studied,have studied
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答案和解析
when I was at university,这是过去式,所以排除have studied.
其次,是我在大学期间的两年里学习的(大学一共四年),不是过去的过去哦,所以排除had studied.用一般过去式studied.