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He did not leave his office until he had finished work这里从句为何

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He did not leave his office until he had finished work这里从句为何用过去完成时?
He did not leave his office until he had finished work这里从句为何
因为这里有“过去的过去”这个条件.
即在“did not leave”之前
再问: 但是句子中是he did not leave his office是没离开,发生在he had finished work之前,前面的应该用过去完成时
再答: “完成工作才离开” not...until...直到……才……, 没有到……就不……
再问: 可这是中文的翻译,中国人自己想出来的,外国人可能不那么想
再答: 事实是先finish,后leave