问题补充:
It is not rare in that people in fifties are going to university for further education.
A. 90s; the
B. the 90s; 不填
C. 90s; their
D. the 90s; their
答案:
A. 90s; the
B. the 90s; 不填
C. 90s; their
(答案→)D. the 90s; their
解析:表示在几十年代,在以 ty 结尾的复数基数词前加 the; 表示在某人几十多岁时,用 one’s 加以 ty 结尾的复数基数词。