题目内容

About  ______ of the books in our school library are written in Chinese.
A．four-fifthB．four-fifths
C．fourth-fifthsD．fourths-fifth
B

试题分析：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。
点评：英语分数的表达规则比较固定，学习中应牢记这些基本规则。需注意的是，由分数修饰的主语后面谓语动词的数，和被修饰主语的单复数保持一致。
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