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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(jìn)行時(shí)。句意:杰克正在實(shí)驗(yàn)室里工作,這時(shí)候突然斷電了。本句考查when引導(dǎo)的并列句,句型為:sb. was/were doing sth. when…表示一個(gè)動(dòng)作在進(jìn)行,另一個(gè)動(dòng)作發(fā)生了,when在句中是并列連詞,故此處用過去進(jìn)行時(shí),故選C項(xiàng)。

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