题目内容

I really don't know _________ this question.

A. which to do B. which to answer C. what to do D. how to answer

D 【解析】句意:我真不知道如果回答这个问题。which to do做哪一个;which to answer回答哪一个what to do做什么。how to answer如何回答。此处有宾语question,故不用疑问词what,which。故选D。
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