About _____________ of the students this year were born in the 1990s.

A．three fiveB．three fifthsC．third fifthsD．third fifth

B

解析試題分析：句意：今年大約有五分之三的的學生是20世紀90年代出生。在英語中的分數(shù)，分子用基數(shù)詞，分母用序數(shù)詞，當分子大于一時，分母用復數(shù)形式。所以選B。
考點：考查數(shù)詞。

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