It is the third time that I ___ Shanghai.

It is the third time that I ___ Shanghai.

It is the third time that I have been in Shanghai.

have been in 是某人正在上海，说这是我第三次来上海。

have been in

It is the third time that I gone to Shanghai.

序数词（first，再一” 例句：i`ve read the book a second time;the third 是有区别的;an意为”又一.这本书我又读了一遍. a third 译为”又一，再一”表示已经转了两次弯了，现在是第三次转弯．意思上和无大区别．只是译法不同． 语法总结,second,third,fourth－－）前加a/the a the most最高级，要加the a third/

came

have been to(in) 前面时态是现在时，指的是直到现在为止是我第三次去上海，那么指过去发生的事对现在的影响，所以用完成时。