It is not rare in that people in fifties were going to university for further educationA.

问题补充：

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

A. 90s; the

B. the 90s；/

C. 90s; their

D. the 90s; their

答案：

A. 90s; the

B. the 90s；/

C. 90s; their

(答案→)D. the 90s; their

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