When he arrived at the hospital, he asked worriedly who was (operate) ______ on.

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问题 When he arrived at the hospital, he asked worriedly who was (operate) ______ on.

选项

答案 being operated

解析本句考查了两个知识点，一是过去进行时，二是被动语态。operate on somebody表示对某人进行手术，当somebody提前作主语时(在本句中是who)，operate on应该用被动形式。根据句意，operate on应该是过去正在发生的动作，所以应该使用其过去进行时态。

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