This is the third time I the movie“Forrest Gump”．
A.watchB.am watchingC.have watchedD.have been watching在线课程C
解析：
在It is the fist／second／third…last time that…这一结构的that从句中谓语动词必须用现在完成时，实际上是表示到说话时为止动作发生的次数。