It is not rare in that people in fifties are going to university for further education.A.

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A. 90s, the
B. the 90s, /
C. 90s, their
(答案→)D. the 90s, their
解析：此题第一空考查年代表示法。英语中 “年代”用数词的复数形式表示, 前面需加定冠词, 例如：八十年代：the eighties/ 80s/ 80’s, 但不可以写成eighty’s。第二空考查年龄的表示法。in one’s fifties “五十多岁”；in one’s late fifties“五十七、八岁”；in one’s early fifties“五十二、三岁”。“in + one’s +基数词的复数”表示“某人几十多岁时”也是高考中有关数词的命题热点。