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】

試題分析:考查what和how接動(dòng)詞不定式的使用。what是代詞,在作疑問詞時(shí),表示“什么”,在句中作do的賓語;how是副詞,在做疑問詞是表示“怎樣”,在句中通常作狀語。what和how接動(dòng)詞不定式時(shí),通常是:what to do 和 how to do it。 句意:這個(gè)數(shù)學(xué)問題太難了,我真的不知道怎么做。故選C。

考點(diǎn):考查what和how接動(dòng)詞不定式的使用

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