【題目】The math problem is so difficult I really don't know____

A. how to do itB. how to doC. to do whatD. what to do it

【答案】A

【解析】

句意“這個(gè)數(shù)學(xué)問(wèn)題太難了,我真地不知道如何做”。本題考查“疑問(wèn)詞+to do”結(jié)構(gòu),排除C;how表示方式,后要接賓語(yǔ),即how to do it。排除B;而what to do中,whatdo的賓語(yǔ),后不加it,排除D。故選A。

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