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
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
答
我见过的一般是it has been proved that...
答
应该也有的吧
只是时态不同而已啊
答
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...