The doctors ()(operate)on a patient when the light suddenly went out 动词填空..

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The doctors ()(operate)on a patient when the light suddenly went out 动词填空..

The doctors ()(operate)on a patient when the light suddenly went out 动词填空..
The doctors ()(operate)on a patient when the light suddenly went out 动词填空..

The doctors ()(operate)on a patient when the light suddenly went out 动词填空..
were operating
这是when引导的时间状语从句,一个动词正在发生过程中发生了另一个短暂的动作.