I decide which one to buy.为什么要用which one to buy?而不用which to

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I decide which one to buy.为什么要用which one to buy?而不用which to buy?谢谢.
I decide which one to buy.
为什么要用which one to buy?
而不用which to buy?谢谢.

which这个代词只可以用this,that这样的词回答,换句话说,如果用which提问的话,就用this,that回答,如果用which one提问的话,就用this one,that one 回答.
这里显然要用this one,that one,the blue one,the red one等来回答,所以要用which one to buy,不用which to buy

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