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He did not know _ to do about it.

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He did not know _ to do about it.
A.what B.how
B为什么错了?
He did not know _ to do about it.
A
因为 to do 缺宾语,所以选疑问代词what,疑问副词how 不可以做宾语
再问： 为什么要宾语呢？主谓后面接一个how的从句不可以吗？
再答： 可以呀！ 从句也是作宾语的呀，英语中叫“宾语从句” He did not know（主谓语） 【what】_ to do about it 【带疑问词的不定式短语作宾语】. He did not know（主谓语） 【what】_ he should do about it 【what引导的从句作宾语----宾语从句】.
He did not know _ to do about it. I really do not know about it 请教he may not know about it Because he dod not know how to do it,he turned to her for he He did not know what he could do.同意句 he told me not to worry about it 为什么not不换成 do not? 1.his wallet-----he did not know what to do next.2.his walle He didn't know what to do about it 为什么填what 不是有it吗? He is not about to do that He does not know how to do (it)还是what to do (it) 还带括号吗 He did not know选择 i do not know anything about it.改同义句