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【题目】I don't know_______ now.

A. how to do B how to do it C. what to do D. B and C

【答案】D

【解析】句意:现在我不知道怎么办。作为动词know的宾语,用疑问词+to do,动词do后面缺少宾语,用疑问词what充当;用疑问词how时,动词do后面有宾语it。故选D。

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