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【题目】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“这个数学问题太难了,我真地不知道如何做”。本题考查“疑问词+to do”结构,排除Chow表示方式,后要接宾语,即how to do it。排除B;而what to do中,whatdo的宾语,后不加it,排除D。故选A

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