the young man was seen _____the house _____a bike 写to pass :on 为什么,不是see sb do吗

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the young man was seen _____the house _____a bike 写to pass :on 为什么,不是see sb do吗

see sb do sth是争确的,但其改为被动结构时,必须接带to的不定式.
He was seen to enter the office.
他被看到进入了办公室.