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By the time he was 12, Edison______(begin)to make a living by himselfhad begun此题
By the time he was 12, Edison______(begin)to make a living by himselfhad begun此题
游客
2023-10-03
49
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问题
By the time he was 12, Edison______(begin)to make a living by himself
选项
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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