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I don’t know             .
A what to do it   B how to do it C how to do  D what should I do
B

试题分析:疑问词加不定式可以构成不定式短语,在句子中充当主语,宾语和表语。其中what在不定式中多充当宾语,表语;how多充当方式状语。故选AC结构有误。宾语从句中的语序一般为陈述语序,故排除D。选B,我不知道怎样做。
点评:此题题型的解答,一般可以通过分析不定式短语表达的含义和不定式的结构上来进行区分。
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