第1个回答 2018-10-27
简而言之: in 比较大范围些:从世纪到星期都是用in in the 21st century in June in the week in the year in the month in summer in the summer of 2014 而on小一些:天就用on 也包括具体的某天的上下午晚上 on Saturday; on June 1st on a sunny morning on the afternoon of Saturady本回答被网友采纳