Which is cheaper ,this one and that one?哪错了怎么改

问题描述:

Which is cheaper ,this one and that one?哪错了怎么改

and ----or
这里是两个之间做选择所以用or

which one is more cheaper, this one or that one?

Which is cheaper,this one (or) that one.
and用于肯定句,疑问句用or

and-or

疑问句应该使用or:Which is cheaper ,this one or that one?