—They have built another new library for the students—About_____ of the books in their library are written in English．A.four fifthB.four fifthsC.fourth fifthsD.fourths fifth
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B解析英语分数，分子读做基数词，分母读做序数词。如果分子是一，则分母直接读做序数词；如果分母大于一，则序数词要加s变成复数。
如:2/3 读做 two thirds.故选B,五分之四。