单选题His father served in&nbsp

问题补充：

单选题Hisfatherservedinthearmyin________whenhewasin________.A.the 1950s; his twentiesB.1950s; twentiesC.1950’s, the twentiethD.the 1950s; the twentieth

答案：

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