请问有it is proved that

问题描述:

请问有it is proved that
我记得有it was proved that 不知道有没有it is proved that

从意思上来说it was proved that...是指“(在过去)被证明.”的从句所以可以存在时态的差别 “(在现在)得到证明...”楼上的,这里it没有用被动是因为it在这里是形式主语,真正的主语在that后面的从句,it只是为了避...