were greatly impressed 印象深刻
presented in Tianggon-1 space station. 是过去分词短语做后置定语修饰先行词 video class
等于: which was presented in Tianggon-1 space station
present 和video class 视频课 是被动关系, 故用表被动的过去分词
如不明白请追问,如果满意请【采纳】
祝学习进步
were greatly impressed 印象深刻
presented in Tianggon-1 space station. 是过去分词短语做后置定语修饰先行词 video class
等于: which was presented in Tianggon-1 space station
present 和video class 视频课 是被动关系, 故用表被动的过去分词
如不明白请追问,如果满意请【采纳】
祝学习进步