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     of the students       boys in our class.

A．One fifth; are B．One fifths; are
C．First fifths; is D．One five; is

A

解析試題分析：句意：在我們班的學生中有五分之一是男孩。分析：考查分數的表示方法，分子用基數詞，分母用序數詞，如果分子超過一，分母要加s，明確第一項正確，同時學生是可數名詞，因此be動詞用are.故選A
考點：考查數詞的用法。

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