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He found          very difficult         the math problem.

A.that;to solveB.this;solving
C.it;to solveD.it;solving

A

解析试题分析:that指示代词,指代距离说话人较远的人或者事物;it人称代词,可以用作形式宾语或者形式主语,指代下文不定式内容。句意:他发现解决这个问题非常难。本句中it做形式宾语指代下文不定式内容,故选C。
考点:考查固定句式

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