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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

D。


解析:

表示在幾十年代,在以 ty 結尾的復數基數詞前加 the; 表示在某人幾十多歲時,用 one’s 加以 ty 結尾的復數基數詞。

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