【题目】The two countries have been________ war ________ each other for more than five years.
A.at; for
B.in; against
C.at; with
D.in; with

【答案】C
【解析】与……处于交战状态”为be at war with，这是可以延续的状态；句意：这两国处于战争状态五年多了。根据句意，故选C。