after working for two hours,i found it impossible' to complete the paper in time.it处可以用that吗?为什么?

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after working for two hours,i found it impossible' to complete the paper in time.it处可以用that吗?为什么?

after working for two hours,i found it impossible' to complete the paper in time.it处可以用that吗?为什么?
after working for two hours,i found it impossible' to complete the paper in time.
it处可以用that吗?为什么?

after working for two hours,i found it impossible' to complete the paper in time.it处可以用that吗?为什么?
不能 it在此为形式主语