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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?
题目详情
He did not leave his office until he had finished work这里从句为何用过去完成时?
▼优质解答
答案和解析
因为这里有“过去的过去”这个条件.
即在“did not leave”之前
即在“did not leave”之前
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