题目内容
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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