问题
选择题
My father served in the army in when he was in .
A．1950s; twenties
B．the 1950s; his twenties
C．the 1950s; the twenties
D．1950s; the twenties
答案
答案：B
考查短语。in the 1950s 在20世纪50年代，这是固定的表达。In one’s twenties 在某人20多岁的时候。选B。