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：.
C。根据主句中的felt可知，其后的宾语从句应用过去时态，故可排除B和D；再根据语境和句中的for years可知用过去完成时比用一般过去时更佳。