内蒙古坝上:Which one did you choose?

Which one did you choose? Which one did you choose? which one do you choose? Why? Tell one thing about which you feel regretful. 翻译:which one do you want to buy? 翻译:which one don't you want to buy? 翻译:"we have many here. which one do you like?和that blue one please. among the places you have ever been to which one do you like best Which one is right? Who did you meet on your way home? No one. 可以用None么？why？