高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?
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![高中英语语法I began to study English three years ago.How long did you study English last year?两句话中为什么动词都是用原形study而不是studied?](/uploads/image/z/10469926-46-6.jpg?t=%E9%AB%98%E4%B8%AD%E8%8B%B1%E8%AF%AD%E8%AF%AD%E6%B3%95I+began+to+study+English+three+years+ago.How+long+did+you+study+English+last+year%3F%E4%B8%A4%E5%8F%A5%E8%AF%9D%E4%B8%AD%E4%B8%BA%E4%BB%80%E4%B9%88%E5%8A%A8%E8%AF%8D%E9%83%BD%E6%98%AF%E7%94%A8%E5%8E%9F%E5%BD%A2study%E8%80%8C%E4%B8%8D%E6%98%AFstudied%3F)
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