He  slept  in a r ..

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本题windows和填空区省略了关系代名词which(或that) were

windows which were open ：打开的窗户

windows which were opened：被（某人）打开的窗户

原句可拆成两句：

He slept in a room with the windows. 他在有窗户的房间里睡觉。

The windows were open. 窗户是开的。

依语意 选open会比opened还好

如说明不清楚 请高手补完或参阅英文文法书