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____have you been travelling?since i was a boy.A Since when

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____have you been travelling?since i was a boy.A Since when B When C for when 选择哪一个,为什么
____have you been travelling?since i was a boy.A Since when
A
Since when 表示动作起始于过去是一个时间点,一直延续的现在,和现在完成进行时的谓语动词时态相呼应;而when是“当...的时候”,不是前者所表达的那样的时间;for when的说法不存在.