I found him_in an armchair.A:seated B:seating.选哪个,为什么?

I found him_in an armchair.A:seated B:seating.选哪个,为什么? When I arrived, I found the boy_____there A seating B seated I saw him ____under a tree,thinking.A.sat B.seated C.seating i found him___(seat) on a bench 为什么是seated? I found Vivian ( )at her desk.A.seated B.being seated I found him seated there,reading.为什么要用seated? I found them __at a desk writing.A seat B sat C seated D sea 这句话里为什么用seated而不用seating? 第六个为什么填seated不是seating,求仔细讲解 Please remain--------?为什么答案是seated而不是seating?remain seating不 remain seating 和remain seated remain seating和 remain seated