I find difficult us to work out the math problems.

A. its; of B. its; for

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

D 【解析】句意：我認(rèn)為我們很難做出那些數(shù)學(xué)難題。根據(jù)句型find it difficult for sb to do sth“認(rèn)為某人做某事是很難的”，it是形式主語，to do sth是真正主語，故選D。
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