题目内容

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

试题分析：句意：今年大约有五分之三的的学生是20世纪90年代出生。在英语中的分数，分子用基数词，分母用序数词，当分子大于一时，分母用复数形式。所以选B。
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