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【题目】I don't know ___________ to do.

A. howB. whatC. whyD. when

【答案】B

【解析】

句意:我不知道做什么。

how怎样,如何;what什么;why为什么;when什么时候。这四个选项都是疑问词,后面都可以跟动词不定式,构成疑问词+不定式结构,在句中作宾语。do是及物动词,后面缺少宾语,因此应用疑问代词what。选B

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