We first met on a train in 2000．We both felt immediately that we each other for years.
A. knew
B. have known
C. had known
D. know
网友回答
A. knew
B. have known
(答案→)C. had known
D. know
解析：考查时态。句意：在2000年我们第一次在火车上相见，我们都立刻感觉到我们多年前已经认识了。根据句中时态用一般过去时，可知用过去的过去，即过去完成时，选C。