He stood at a window on the second floor,_he could see enemy

He stood at the window,from where he could see what was happ The captain stood by the window, _____ he could see the top The captain stood by the window,_____ he could see the top o he stood by the window,_____he could see what was happening at the second floor 还是on the second floor He stood up ( ) he could see the words on the blackboard cle 一个英语单选He stood by the window,＿＿he could see what was happeni He stood on top of the building_____they could see the whole he lives on the second floor.就second划线提问、 请问on the second floor 与 at the second floor 有什么区别? on the second floor 与 at the second floor 有什么区别? It was quite dark,but i could see a man lying on the floor,t