题目内容

I don’t know _________.
A．whattodoitB．howtodoC．whattodoD．todowhat
C
考查非谓语动词. 疑问词加不定式作用相当于一个宾语从句，句意:我不知道做什么.选项AD结构有误,选项Bhow不能做宾语,故选C.
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