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
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(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