They are both very nice.I don’t know A. what to chooseB. to choose whatC. which one to cho

问题补充：

They are both very nice.I don’t know

A. what to choose

B. to choose what

C. which one to choose

D. to choose which one

答案：

A. what to choose

B. to choose what

(答案→)C. which one to choose

D. to choose which one

解析：what意思是什么，一般对未知的具体事物进行提问。Which意思是哪一个，一般对特定对象中的哪一个进行提问。句意：我们都非常不错。我不知道选哪一个。Which指代前文提到的任何一个，故选C。