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see sb do sth 与see sb doing sth,一道选择题

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see sb do sth 与see sb doing sth,一道选择题
—Is Jack in the library?—Maybe. I saw him _out with some books just now.A.going B.go请附详细讲解!谢!
see sb do sth 意思是"看见某人做..." 看见了整个过程
see sb doing sth 意思是"看见某人正在做." 看见的瞬间
比如
I saw him enter the building .我看见他走进大楼.( 一整个过程
I saw him dancing .我看见他在跳舞( 瞬间动作)
所以楼主的题应该选B -