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

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

A. 90s; theB. 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。

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