It was for the first time that the two countries an agreement.A. reachedB. have reachedC.

问题补充：

It was for the first time that the two countries an agreement.

A. reached

B. have reached

C. had reached

D. will reach

答案：

(答案→)A. reached

B. have reached

C. had reached

D. will reach

解析：考查时态：句意：这是两个国家第一次达成协议。这是强调句，还原后是：The two countries an agreement for the first time. 时间是for the first time，用一般过去式，选A。