[题目]I don't know to do.A. howB. whatC. whyD. when 题目和参考答案——青夏教育精英家教网—

题目内容

【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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