U-7：up to 从事于 A:Do you know what John has been up to since he left school? A:你是否知道约翰离开学校的近况？ B:I only know that he went to Japan two years ago. B:我只知道他两年前去了日本。
U-7：up to 从事于
A:Do you know what John has been up to since he left school?
A:你是否知道约翰离开学校的近况？
B:I only know that he went to Japan two years ago.
