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9.He found          very difficult         the math problem.(  )
A..this,solvingB..that,to solveC..it,solvingD.it,to solve

分析 我发现解决这个数学问题很难.

解答 答案:D.考查形式宾语.句意"我发现解决这个数学问题很难.."考查句型结构:主语+find+it+形容词+to do sth.这里用it做形式宾语.真正的宾语是不定式短语.因此答案是D.

点评 当不定式(短语)、动名词(短语)或从句在某个句子中作宾语时,为保持句子结构平衡,避免句式结构的混乱,常用it作形式宾语,而将真正的宾语放在句尾.此时it仍只起先行引导作用,本身无词义.

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