which dress to buy是动词不定式短语,要由特殊疑问词来引导,特殊疑问词要放在短语的前面.
其结构就是：特殊疑问词+to do.又如：
I don't know whom to ask.
I wonder when to leave.
Can you tell me how to get there?
I can't decide which dress to buy 为什么不可以说是I can't decide to
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