英语语法问题I don't know which I should buy和 I don't know which on

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英语语法问题
I don't know which I should buy和 I don't know which one I should buy为什么不一样啊which和which one不是都是指哪一个吗?

现在你有语境了,回答起来就更容易了.
1 I don't know which I should buy--------比如说,There are three types of milk products for sale,如果你只想强调which milk to buy,你完全可以说 which to buy ,因为milk是不可数名词,不能用one指代milk.
2 I don't know which one I should buy---------比如说 one of the three types of milk products.这里,你指强调one type,one是可数名词单数形式,所以,which one中的one不能省略.

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