Question

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

Answer 1

C

.
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。