B
此题考查疑问词和动词不定式连用充当简单句的某个句子成分。“疑问词 + 动词不定式”是英语中常用的一种结构。在句中可以作主语、动词或介词的宾语以及表语。
I really don’t know____________. A．how to do B．what to do C．
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