It is said that about of the books and magazines in the world in English.
A. four-fifths;are written B fourth fives;are written
C, four fifth;were written D fourth fifths; were written
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解析：本题考查分数的表达和主谓一致。分数表达：分子用基数词，分母用序数词，当分子大于1，分母用序数词加s。本题4/5用four—fifths，而五分之四的书籍和杂志是可数名词，后面的谓语动词要用复数。故选择A。