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【题目】I find difficult us to work out the math problems.

A. its; of B. its; for

C. it's; of D. it; for

【答案】D

【解析】句意:我认为我们很难做出那些数学难题。根据句型find it difficult for sb to do sth“认为某人做某事是很难的”,it是形式主语,to do sth是真正主语,故选D。

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