______ these pictures, I couldn’t help thinking of those days when I was in Beijing and ______ from the top of a thirty-storeyed building, Beijing looks more beautiful. 答案是seeing, seen。我的答案是seeing, seeing。为什么啊?谢谢!
第一空应填 Seeing,因为它的逻辑主语是I,而I与see为主动关系,故用现在分词seeing;第二空应填 seen,因为它的逻辑主语是Beijing,而Beijing与see之间为被动关系,故用过去分词seen。句意为:看到这些照片,我不情不自禁地想起了我在北京的那些日子。从一栋30层高的建筑物顶层看去,北京看起来更美丽了。