By the time he was 12, Edison______(begin)to make a living by himselfhad begun此题

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问题 By the time he was 12, Edison______(begin)to make a living by himself

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答案 had begun

解析此题考查的是动词的时态。“by”后面接的是表示过去的时间状语，所以主句要用过去完成时态。

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[originaltext]W:WhatdoesJackdoforaliving?M:Hesellsvegetablesandfru