'it is believed that +从句' 中that可以省略吗?

'it is believed that +从句' 中that可以省略吗? 表语从句中that可以省略吗? it is believed that insist后that从句中that可以省略吗 adj + that 从句that 可以省略吗 it is said that 可以省略that吗 It is time that that可以省略吗 句型It is said that 中的that可以省略吗 主语从句 it is ,that能省略吗 it is generally believed that 定语从句中that可以省略么? it is the first time that 是状语从句还是定语从句,that可省略吗?