of his time been spent on studies every day.A. Four-fifths; hasB. Four-fifths; haveC. Fo

问题补充：

of his time been spent on studies every day.

A. Four-fifths; has

B. Four-fifths; have

C. Four-five; has

D. Fourths-five; have

答案：

(答案→)A. Four-fifths; has

B. Four-fifths; have

C. Four-five; has

D. Fourths-five; have

解析：英语分数表达法，分子读坐基数词，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。主语为抽象名词,谓语动词用第三人称单数形式,故选A.