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极简单非谓语动词问题After shopping all day in crowded department store

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极简单非谓语动词问题
After shopping all day in crowded department stores, Kathy and Erica were as tired as【 】 a marathon
答案给的if they had run 但是为什么having run 不成……
极简单非谓语动词问题After shopping all day in crowded department store
as if引导的虚拟语气.用过去完成时表示过去并没有做的事情(在此是好像跑过马拉松一样,但其实他们没跑)