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

解析本题结尾部分有介词“on”，表明动作正在进行，要用现在进行时；而从句中的主语“who”是“on”的宾语，可以看出“who”是动作的承受者，与“operate”之间应是被动关系，要用被动语态，所以本题用的是过去进行时的被动形式。题中的介词“on”是解题关键。

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