He found very difficult the math problem.

A.that；to solveB.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(yuǎn)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(gè)問題非常難。本句中it做形式賓語指代下文不定式內(nèi)容，故選C。

考點(diǎn)：考查固定句式

 

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