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7.Threefifths(five) of the children have finished the exercises.

分析 五分之三的孩子完成了练习.

解答 答案:fifths
根据题干Three…(five) of the children have finished the exercises空格前为基数词three,所给词为基数词five,结合句意可知表达五分之三的孩子完成了练习,根据英语中分数的表达,先说分子数后说分母数,分子用基数词,分母用序数词,分子数超过"1"时,分母用复数.five对应的序数词是fifth,故五分之三表达成three fifths,故填fifths

点评 本题考查用所给单词的适当形式填空,首先要根据语境明确句意,然后再根据相关语法对所给单词在形式上做出正确的变化.本题考查分数的表达

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