It was for the first time that the two countries an agreement.
A. reached
B. have reached
C. had reached
D. will reach
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(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。