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【题目】Jack _______ in the lab when the electricity went out.

A.worksB.has workedC.was workingD.would work

【答案】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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