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。
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