About _____________ of the students this year were born in the 1990s.
A．three fiveB．three fifthsC．third fifthsD．third fifth
B

試題分析：句意：今年大約有五分之三的的學(xué)生是20世紀(jì)90年代出生。在英語中的分?jǐn)?shù)，分子用基數(shù)詞，分母用序數(shù)詞，當(dāng)分子大于一時(shí)，分母用復(fù)數(shù)形式。所以選B。
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