有一读者问这样一道选择题：
(1)—Do you know the town at all?
—No, this is the first time I _________here.
A.was B.have been C.came D.am coming
答案是B，但为何C不对？
在这种句型中，皆须用完成时态，再如：
(2)This is the first time I have met him.
如指过去，则须用过去完成时，如：
(3)It was the first time I had met him.
但如将(the)first time用作从属连词，则可用过去一般时，例如：
(4)The first time I met him, he was about your age.
