【題目】I think _______ is really difficult for us to work out this kind of math problem.

A. it B. this C. that D. one

【答案】A

【解析】

試題分析：句意：我想做出這種數(shù)學(xué)題對于我們來說真的是困難的。it 它；形式主語或形式賓語；this這個；that那個；one一個。這句話中使用的句型是It is +形容詞+for sb. to do sth.，對于某人來說做某事是……的。故選A。

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