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he has been a good storyteller since he was a young child.为什

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he has been a good storyteller since he was a young child.为什么不是had been 英语
he has been a good storyteller since he was a young child.为什
since he was a young child 一般和现在完成时连用
因为since 是指一段始于过去延续至现在的一个时间段,不是指“过去的过去”