Have you ever littered _________ things.(填上介词或副词)

造句：Have you ever. Have you ever heard Have you ever have you ever与have you ever been的区别 you have ever said before和you have ever said 英语造句have you ever “Have You Ever Seen Me? Have you ever seen snow? have you ever.是什么句型 have you ever fed them? Have you ever had these? Have you ever been employed? Where have you ever been? have you ever [ ] [drink]coke? Have you ever ( ) [study] abroad? have you ever move house have you ever have Italian food? have you ever 和 do you ever 有什么区别?