His father served in the army in when he was in .A. the 1950s; his twentiesB. 1950s; twen

问题补充：

His father served in the army in when he was in .

A. the 1950s; his twenties

B. 1950s; twenties

C. 1950’s, the twentieth

D. the 1950s; the twentieth

答案：

(答案→)A. the 1950s; his twenties

B. 1950s; twenties

C. 1950’s, the twentieth

D. the 1950s; the twentieth

解析：in the 1950s ，in his twenties 表示在他的几十，故选A