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One third of the class _____ agreed to be volunteers to help the aged this vocation.
A.areB.isC.hasD.have
D
考查主谓一致。句意:这个假期这个班三分之一的学生同意作为志愿者帮助老年人。本句中class为集合名词,表示复数含义,当前面有分数修饰时,后面谓语动词与名词保持一致,故选D。
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