With an appropriate preposition: It is difficult for a casual ob

分类: 英语语法(00831) 发布时间: 2024-08-22 09:52 浏览量: 0
With an appropriate preposition: It is difficult for a casual observer to distinguish ___________artificial and natural lakes.
【正确答案】:between 


【题目解析】:两者之间用between ,三者或三者以上的用 among。