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Jim was seen () out of the room

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Jim was seen () out of the room
为什么不是go或going?
Jim was seen () out of the room
原型是see ...do变为被动语态要加to,即be seen to do sth.
原句的主动表达:Sb see Jim go out of the room.
be seen to do sth.表示主语做的动作整个过程(一般比较短)都被看到.
be seen doing sth.强调被看到时动作正在进行.
很显然Jim已经走出教室了,没有正在进行