This is the first time I___ here.a.was b.have been c.came d.am coming 选哪个?为什么?

题目

This is the first time I___ here.a.was b.have been c.came d.am coming 选哪个?为什么?
This is the first time I___ here.
a.was b.have been
c.came d.am coming
选哪个?为什么?
这句话怎么翻译？

答案

选择B.我说话的时候已经在这儿了,如果用D,那我正在来的路上.