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he flew a doctor to a Welsh village.____he has flown to many

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he flew a doctor to a Welsh village.____he has flown to many unusual places A from then B by then
C by that time D since that time
选D,我怎么觉得是新概念原文.
第一句是他飞去过Welsh的山村,是过去式.第二句有“has flown”是现在完成时,BC排除,只剩AD.习惯上更倾向于D,表达更地道.