I don't know_______ to help him. A. how should we do B. what we should do C. what should we do

I don't know_______ to help him. A. how should we do B. what we should do C. what should we do
I don't know_______ to help him. A. how should we do B. what we should do C. what should we do

I don't know_______ to help him. A. how should we do B. what we should do C. what should we do
B.有了do就不用how,do后加名词所以用what 又为宾语从句,所以陈述句语序

B，后面是宾语从句，语序正常how should we do， how should we do 与what should we do有什么不同？how should we do本身是个病句，正确的是what should we do,因为do是及物动词，后面接宾语，what 可作宾语而how不可以（查字典就知道了）。排除A，know是及物动词，后面接宾语，接句子就是宾语从句了...

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B，后面是宾语从句，语序正常

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B

C

B