I don’t know the question.A. what to answerB. how to answerC. to answer whatD. to answer

问题补充：

I don’t know the question.

A. what to answer

B. how to answer

C. to answer what

D. to answer how

答案：

A. what to answer

(答案→)B. how to answer

C. to answer what

D. to answer how

解析：本题考查“疑问词＋不定式”结构的用法，这种结构可在句子中作主语、宾语、表语等。

这种结构中，疑问代词须接及物动词或相当于及物动词的短语(who, which除外)，如：【误】 I don’t know what to talk.【正】 I don’t know what to talk about.但可以说：We haven’t decided who (which) to go. 我们还没定谁(哪个)去。

这种结构中的疑问副词后要接不及物动词；若接及物动词, 要有动词的宾语。如：I don’t know how to talk. 我不知如何谈。I wonder if you could tell me how to do it. 不知您能否告诉我如何去做这件事。(不能说: ... how to do.)

本题空格后已有宾语the question,故不能选A，只能选B。