He found_ ________very difficult ________the math problem．

A．that, to solve B. this, solving

C. it, to solve D. it, solving

 

C

【解析】試題分析：that指示代詞，指代距離說話人較遠的人或者事物；it人稱代詞，可以用作形式賓語或者形式主語，指代下文不定式內(nèi)容。句意：他發(fā)現(xiàn)解決這個數(shù)學(xué)問題非常難。本句中it作形式賓語指代下文不定式內(nèi)容，故選C。

考點：考查固定句式的用法。

 

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