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53.No sooner had he sat down to lunch than there was a knock at the door.为什么用than.而不是when

分类: 作业答案 • 2021-12-20 09:28:19

问题描述：

53.No sooner had he sat down to lunch than there was a knock at the door.为什么用than.而不是when

答

no sooner.than. 是固定搭配