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The math problem is so hard. I really don’t know _____.

A. what to do it B. how to do

C. how to do it D. what do it

C

【解析】

试题分析:考查what和how接动词不定式的使用。what是代词,在作疑问词时,表示“什么”,在句中作do的宾语;how是副词,在做疑问词是表示“怎样”,在句中通常作状语。what和how接动词不定式时,通常是:what to do 和 how to do it。 句意:这个数学问题太难了,我真的不知道怎么做。故选C。

考点:考查what和how接动词不定式的使用

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