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    精英家教网 > 高中英语 > 题目详情
    ________ several times，but he still doesn't know how to do it correctly.
    A．Although I've taught him
    B．I've taught him
    C．Having been taught
    D．Having taught
    B
    although不能与but连用，故不能选择A。若选C，必须把并列连词but去掉，这样就变成了一个简单句，为现在分词短语作让步状语。
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