after后面加-ing?新概念二册L20,讲动名词,有一句话:After having spent whole mornings on the river,I always go home with an empty bag.这里的having是因为after是连词吗?after在这里不是介词吧?为什么要用having?

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after后面加-ing?新概念二册L20,讲动名词,有一句话:Afterhavingspentwholemorningsontheriver,Ialwaysgohomewithanemptybag.

after后面加-ing?新概念二册L20,讲动名词,有一句话:After having spent whole mornings on the river,I always go home with an empty bag.这里的having是因为after是连词吗?after在这里不是介词吧?为什么要用having?
after后面加-ing?
新概念二册L20,讲动名词,有一句话:After having spent whole mornings on the river,I always go home with an empty bag.这里的having是因为after是连词吗?after在这里不是介词吧?为什么要用having?

after后面加-ing?新概念二册L20,讲动名词,有一句话:After having spent whole mornings on the river,I always go home with an empty bag.这里的having是因为after是连词吗?after在这里不是介词吧?为什么要用having?
这里就是介词啊,介词短语作状语