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_______ he was 12, Einstein had learned advanced mathematics by himself.

A.As soon as B.At the time C.By the time D.During the time

C

解析试题分析: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。
考点:考查连词

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