About——of the students in the school were born in the ____.A

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About——of the students in the school were born in the ____.A.two-thirds:1990s B.two-third:1990s
这道题为什么选择A?

第一空：分数的表达方式：基数词-序数词（当基数词大于等于2时,序数词加s）
第二空：二十世纪九十年代
望采纳~
再问：分数的表达方式不是不用''-''这个符号么这个不是复合词么我觉得应该不加s啊
再答：一个小横岗可有可无，都没有错的。小横岗和加不加s，是根据分数的语法规则来的。
再问：不好意思啊我想再问一下那么有没有分数的复合词呢有没有分数做形容词就像 two-year-old boy 这样的呢
再答：一般情况下分数的用法是这样的：分数+of+名词。如：one forth of the students(四分之一的学生)

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