问题
选择题
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
D。
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。