【題目】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怎樣,如何;what什么;why為什么;when什么時(shí)候。這四個(gè)選項(xiàng)都是疑問詞,后面都可以跟動(dòng)詞不定式,構(gòu)成疑問詞+不定式結(jié)構(gòu),在句中作賓語。do是及物動(dòng)詞,后面缺少賓語,因此應(yīng)用疑問代詞what。選B

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