【題目】The math problem is so hard. I really don't know how (do) it.

【答案】to do
【解析】考查固定搭配“疑問詞+動(dòng)詞不定式”，故填 to do 。句意是：這道數(shù)學(xué)題這么難，我真的不知道該怎么做。

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