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

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

          【答案】C

          【解析】

          考查過去進行時。句意:杰克正在實驗室里工作,這時候突然斷電了。本句考查when引導的并列句,句型為:sb. was/were doing sth. when…表示一個動作在進行,另一個動作發(fā)生了,when在句中是并列連詞,故此處用過去進行時,故選C項。

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