Looking at him,we found ______ hard to believe that he was w

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Looking at him,we found ______ hard to believe that he was well over seventy.
Looking at him,we found ___c___ hard to believe that he was well over seventy.
A．that B．/
C．it D．what
请问这题选什么．为什么?

选C
find it + adj. + to do sth.[发现做某事怎样]是个常用句型,其中"it"做形式宾语[注意：只能用it,不能用其它词.],不定式短语“to do sth.”才是真正宾语,即： it指代后面的to do sth.

Looking at him,we found ______ hard to believe that he was w He found that the problem was hard to solve. we found that it was hard for us to climb so high a mountain We found that it was too hard to find out the differences be I ran to him and,much to my surprise,I found that he was hur He found that it was hard to learn a foreign language. I found it hard to belive that he was working for the enemy he found that it was hard to sleep可以用另一种方法说么?是什么 He was working hard at English so that he ______ make progre i went to visit him.i found,_____,that he wasn't at home.A.b 请问“We wanted to know what he was at that He had ______ every to believe that his family was very weal