Question

【题目】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; his twenties

Answer 1

【答案】B
【解析】句意：我父亲在20世纪50年代他20多岁的时候在部队服役。in the+整十年代的复数 在……年代；in one's 整十的复数 在某人几十多岁的时候。因此选Ｂ。