◎ 题干
— I don't think we have met before. 
— Yes, once at a party, but we ______.

A. didn't introduce
B. weren't introduced
C. haven't introduced
D. weren't introducing
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—I don't think we have met before.— Yes, once at a party, but we ______. [ ]A. didn't introduce B. weren't introduced C. haven't introduced D. weren't…”主要考查了你对  【一般过去时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。