It is the third time that i have been in Beijing.帮忙分析下这句话的语法结构和时态,为什么用have been

It is third time he______(participate) in the Olympic Games It is the third time I him this month .(see) It is the third time ______you have made the same mistake可以用when吗 it is the third time he.(see) the film calleback to 1942 First time,it is an accident.Second time,it is a coincidence.Third time,it is an illusion.And the forth,you see it wrongly it is the third time that you have been late this month 什么从句 It is the third time that he has been late,_____? it is the third time that you have been late this month是强调句型吗 it is the third time that you has been late 它的反义疑问句 it is the third time i __him this monthhad seenseesawhave seen It is the third time you...late tor school this选择werearehad beenhave been it is the ___ city in the world to host the olympic games for the third time It is＿the third floor. Tim,it is the ( )time in ( )days that you've made the same mistake.A.two ,three B.second ,three C.two,third D.second ,third It is the third time that I ________（visit） the West Lake.请问正确形式是什么, This is the third time you_(ask) me the question It is the third time I_____to the Palace Museum,and I still think It is marvelousA have gone B goC have beenD had been这题答案是C,为什么ABD不对.如果把It is the third time改为It was the third time,答案是不是选D It’s the third time ___such strange incidents.(notice)