It is not rare in that people in fifties are going to university for further education．
A. 90s ; the
B. the 90s; /
C. 90s; their
D. the 90s ; their
网友回答
A. 90s ; the
B. the 90s; /
C. 90s; their
(答案→)D. the 90s ; their
解析：考查数词及代词。In the 90s在90年代；in one’s fifties在某人50多岁时。句意：在90年代50多岁的人很少能够进入大学继续深造。