I really don't know_____.A.what should I do B.what to do C.what does D.how to do正确答案是B,但需要合理的解释说明,我初中英语基础不好,拜托帮我一个一个分析

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I really don't know_____.A.what should I do B.what to do C.what does D.how to do正确答案是B,但需要合理的解释说明,我初中英语基础不好,拜托帮我一个一个分析
I really don't know_____.A.what should I do B.what to do C.what does D.how to do
正确答案是B,但需要合理的解释说明,我初中英语基础不好,拜托帮我一个一个分析

I really don't know_____.A.what should I do B.what to do C.what does D.how to do正确答案是B,但需要合理的解释说明,我初中英语基础不好,拜托帮我一个一个分析
句意：我真的不知道该做什么.
A 不能选的原因是what引导的是一个宾语从句,但宾语从句中应用陈述语气,但A选项中为疑问语序（也叫倒装语序）,所以A不对.
C 不能选的原因是what引导的宾语从句中does缺少宾语.
D不能选的原因是how to do 结构中do缺少宾语.
B 项为 “疑问词+ 不定式”相当于一个名词,可在句中充当主语,宾语等.且在该结构中what作do的宾语.故正确.

B.what to do 作宾语，表示要做的事
to do 作定语
比如例句
i do not know what to do 我不知道我要做什么
希望能采纳，谢谢了

A.what should I do 不是陈述句语序，要改为：what I should do
C.what does不是一个完整的句子，可改为：what it means
D.how to do缺少宾语，可以改为：how to do it
B.what to do 属于 “疑问词+不定式to do”的结构，是名词性的，作了don't know的宾语，是正确的

我真的不知道做什么
选b 属于特殊疑问词+to do 这种结构
d答案这样说 how to do it 就对
a 这样说what i should do就对宾语从句用陈述句语序

B.what to do

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