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  • — 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
    【考点】一般过去时的被动语态
    【分析】请登陆后查看
    【解答】请登陆后查看
    难度：中等
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