【题目】In old times people had a(理论) that the world was flat.
在线课程【答案】theory
【解析】句意：在古代，人们有一个理论：世界是扁的。冠词修饰名词，theory“理论”是名词。故填theory。
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In old times people had a that the world was flat.
编辑：chaxungu时间：2026-04-27 03:15:12分类：高中英语题库
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