I found()impossble for()to work out the math problemA it he B that he C that him D it him 选哪个为什么

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I found()impossble for()to work out the math problemA  it he  B that he  C that him  D it him  选哪个为什么

I found()impossble for()to work out the math problemA it he B that he C that him D it him 选哪个为什么
I found()impossble for()to work out the math problem
A it he B that he C that him D it him 选哪个为什么

I found()impossble for()to work out the math problemA it he B that he C that him D it him 选哪个为什么
D it him
It是形式宾语,真正宾语是不定时的复合结构:for him to work out the math problem