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The number of students __________fifty.
A.  is        B.are        C.be
A

试题分析:句意:学生的人数是50. is 是,单数形式;are 是,复数形式;be 是,动词原形。The number of+复数名词,表示……的数量,谓语用单数形式。故选A。
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