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He found very difficult the math problem.

A.that;to solve B.this;solving

C.it;to solve D.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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