This/It is the first/second time＋that从句,that从句谓语为什么要用现在完成时

This/It is the first/second time＋that从句,that从句谓语为什么要用现在完成时 This/It is the first/second … (序数词) time + that 从句 属于什么从句? 老师在讲“This is the first time that...”句式用法时,说that从句要用“现在完成时”. it is the first/second.time that+现在完成时 it is the first time that是主语从句吗 IT IS THE FIRST TIME THAT 句型是什么从句 It is the first time that从句做什么成分 It is/was the first/second time that 这一句型中引导的是什么从句 可以省吗 it is the first time that 是状语从句还是定语从句,that可省略吗? it is/was the first time +that+clause中从句用什么时态? This is the second time that he has been to Japan.是什么从句? It is the second time that I have been to Beijing是主语从句吗?