______ of his time ______ been spent on studies every day.
A．Four-fifths; hasB．Four-fifths; have
C．Four-five; hasD．Fourths-five; have
A
英語分數(shù)表達法，分子讀坐基數(shù)詞，分母讀做序數(shù)詞。如果分子是一，則分母直接讀做序數(shù)詞；如果分母大于一，則序數(shù)詞要加s變成復(fù)數(shù)。主語為抽象名詞,謂語動詞用第三人稱單數(shù)形式,故選A.
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