【题目】Columbus discovered America by a.
在线课程【答案】accident
【解析】句意：哥伦布偶然发现了美洲。by accident固定短语“偶然，不经意”，故填accident。
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Columbus discovered America by a.
编辑：chaxungu时间：2026-04-27 03:15:38分类：高中英语题库
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