They can( ) where to buy one.(suggestion)为什么

They can( ) where to buy one.(suggestion)为什么 I can't decide which one to buy 为什么不可以to buy which one where to buy 和where can buy一样吗? Where can we go to buy They do not know where they can buy that CD 改为同义句 where they buy,where,they,can,food(连词成句) Where did you_that hat?iwanted to buy one. I can't decide to buy which.They both look nice [on] me.为什么用 I can't decide____ A.to buy which one B.which one to buy C.t Where can I buy it?和Where I can buy it?哪个正确?为什么呢?有什么区别吗? I can't decide to buy which one, well,I can't decide which one to buy.