About of the books in our school library are written in Chinese.A. four-fifthB. four-fift

问题补充：

About of the books in our school library are written in Chinese.

A. four-fifth

B. four-fifths

C. fourth-fifths

D. fourths-fifth

答案：

A. four-fifth

(答案→)B. four-fifths

C. fourth-fifths

D. fourths-fifth

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ACD结构有误，故选B。