【題目】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。它們中的五分之一的球是黃色的。a number of一些，修飾復數(shù)名詞，作主語，故be動詞用復數(shù)形式，故第一空用are。one fifth五分之一。分數(shù)修飾代詞them作主語，故be動詞用復數(shù)形式，故為are。故選D。

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