The old man _A__ the boy on his knees.A.seated B.was seated C.sat D.was sat请高手为我讲解下为什么不选B呢?麻烦给我讲的详细点,我将感激不尽!

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The old man _A__ the boy on his knees.A.seated B.was seated C.sat D.was sat请高手为我讲解下为什么不选B呢?麻烦给我讲的详细点,我将感激不尽!

The old man _A__ the boy on his knees.A.seated B.was seated C.sat D.was sat请高手为我讲解下为什么不选B呢?麻烦给我讲的详细点,我将感激不尽!
The old man _A__ the boy on his knees.
A.seated B.was seated C.sat D.was sat
请高手为我讲解下为什么不选B呢?麻烦给我讲的详细点,我将感激不尽!

The old man _A__ the boy on his knees.A.seated B.was seated C.sat D.was sat请高手为我讲解下为什么不选B呢?麻烦给我讲的详细点,我将感激不尽!
seat on是固定用法
表示 使某人坐在……上面

seat做及物动词,表示“使。。。坐下”,整句意思是老人让男孩子坐在他的膝盖上。
be seated是用被动形势表示主动状态,表示“坐着”,如选B,只能说The old man was seated on his knees.不能再加宾语“the boy"意思为老人坐在膝盖上。