上个周五你在哪,where were you last friday 还是where were you on last friday 或者该怎么说,
问题描述：
上个周五你在哪,where were you last friday 还是where were you on last friday 或者该怎么说,
答
where were you last friday？或者 where have you been last Friday?
答
是where were you last Friday ?
在last, next, today, tomorrow前没有介词