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

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