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Jack _______ in the lab when the electri...

Jack _______ in the lab when the electricity went out.

A.works B.has worked C.was working D.would work

 

C 【解析】 考查过去进行时。句意:杰克正在实验室里工作,这时候突然断电了。本句考查when引导的并列句,句型为:sb. was/were doing sth. when…表示一个动作在进行,另一个动作发生了,when在句中是并列连词,故此处用过去进行时,故选C项。
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