问题
选择题
— Which dress do you like best , Madam ?
— Sorry , I can’t decide now .
A．to buy which one
B．buy which one
C．which one to buy
D．which I should buy it
答案
答案：C
题目分析：句意：你最喜欢哪一件衣服，夫人？对不起，我现在不能决定买哪一件。疑问词可以放在动词不定式之前，和其一起构成动词不定式短语。所以选C。