【題目】The math problem is so hard. I really don't know________.

A. how to do it B. how to do

C. what to do it D. to do what

【答案】A

【解析】句意：這道數(shù)學(xué)題太難了。我真的不知道怎么做它。根據(jù)句意和動(dòng)詞不定式與疑問(wèn)詞連用，構(gòu)成不定式短語(yǔ)作賓語(yǔ)可知空格處應(yīng)用how to do it，表示“怎么做它”，故選A。

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