–Which hair band do you like best madam?–I can’t decide now. I really don’t know .A. to c

问题补充：

–Which hair band do you like best, madam?

–I can’t decide now. I really don’t know .

A. to choose which one

B. choose which one

C. which one to choose

D. which one I should choose it

答案：

A. to choose which one

B. choose which one

(答案→)C. which one to choose

D. which one I should choose it

解析：句意：夫人，你最喜欢哪个发带？——我现在还不能决定。我真的不知道选哪一个。疑问词加不定式作用相当于一个宾语从句，不定式相当于定语，表示具体的将要进行的动作。选项D是宾语从句，逻辑宾语是which one，不用再加代词it，故选C。