we find (it) impossible to finish the work in a week.为什么用it?

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we find (it) impossible to finish the work in a week.为什么用it?

只要填it 就好,it 是形式宾语,指代后面的impossible to finish the work in a week
相同的用法很多,如think suppose

全句是we find that it is impossible to finish the work in a week.宾语从句。

it 来指代后面的

it 是形式宾语,真正的宾语是后面的不定式to finish the work