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    It was not until the teacher had explained it three times _______ how to work out the problem.

    A．did he understand B．had he understood
    C．that he understood D．that he didn’t understood

    C

    解析试题分析：考查固定句型。句义：直到老师解释了三次我才明白了怎样做这个题，首先给我关键词：It  was …+that …,构成强调句型，根据倒装句：not until 位于句首构成：主到从不倒；用语强调句型不倒装，所以C正确。
    考点：考查固定句型

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