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    精英家教网 > 高中英语 > 题目详情
    By the time Einstein was 14 years old, he ________ himself advanced mathematics.
    A．has taughtB．taught
    C．had taughtD．was teaching
    C
    by the time 引导时间状语从句，主句中的动作发生在从句中的动作之前。故用过去完成时。
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