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    精英家教网 > 高中英语 > 题目详情
    _______ he was 12, Einstein had learned advanced mathematics by himself.
    A．As soon asB．At the timeC．By the timeD．During the time
    C

    试题分析：考查连词：A．As soon as一…就，B．At the time在…那个时候，C．By the time到…时候为止，D．During the time在那期间，四个选项BD不能做连词，A的意思不对，选C，句意：到他12岁为止，爱因斯坦已经自学了高等数学。选C。
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