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【题目】A number of the balls ____ in the box. ____ of them ____ yellow.

A. is; one fifths; are B. are; one fifths; is

C. is; one fifth; is D. are; one fifth; are

【答案】D

【解析】

句意:在盒子里是一些球。它们中的五分之一的球是黄色的。a number of一些,修饰复数名词,作主语,故be动词用复数形式,故第一空用are。one fifth五分之一。分数修饰代词them作主语,故be动词用复数形式,故为are。故选D。

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