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12.Susan is one of the girls who _______ a voluntary job in the museum in the past two years.(  )
A.doB.doesC.have doneD.has done

分析 Susan是在过去的两年里在博物馆做过志愿工作的女孩之一.

解答 答案:C
句中who连接定语从句修饰先行词girls,从句的谓语动词要和先行词girls保持一致,也就是说应该使用复数的谓语动词;句中的时间状语in the past two years表示从过去到现在的时间,是完成时态的用法.故选C.

点评 现在完成时表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在.用法有:过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作;表示过去发生的并且持续到现在的动作或状态.

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