问题补充：
About of the students in our school took part in the school sports meeting last Friday.
A. one-thirds
B. two-third
C. one-fifths
D. two-thirds
答案：
A. one-thirds
B. two-third
C. one-fifths
(答案→)D. two-thirds
解析：英语中一般用基数词表示分数的分子，用序数词表示分数的分母。当分子是一时，分数的分母用单数形式，在表示分数时，当分数的分子大于一时，分数的分母要用复数形式。根据分析可知选项ABC结构有误，故选D。
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