Question

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

Answer 1

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。