By the time he was twelve,Edison() to make a living by himself A.would begin B.has begun C.had b

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By the time he was twelve,Edison() to make a living by himself A.would begin B.has begun C.had b

By the time he was twelve,Edison() to make a living by himself A.would begin B.has begun C.had b
By the time he was twelve,Edison() to make a living by himself A.would begin B.has begun C.had b

By the time he was twelve,Edison() to make a living by himself A.would begin B.has begun C.had b
答案是C,had begun
By the time he was twelve,Edison had begun to make a living by himself.
By the time表明截至到某一段时间为止,后面的句子须用完成时态对应.

选择C.had
By the time he was twelve, Edison had to make a living by himself.
在12岁之前爱迪生不得不自己谋生。

C

C

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