题目内容

4．Jack      in the lab when the power cut occurred．（　　）
A．worksB．has workedC．was workingD．would work

分析 句意：杰克正在实验室里工作突然发生了停电．

解答 答案C．本题考查的时态，根据句意，杰克正在实验室里工作突然发生了停电．be doing sth…when 表示正在做某事..突然…，由"occurred"可知本题用过去进行时，故选C．

点评 本题考查的是时态，要熟悉be doing sth…when 表示正在做某事..突然…的用法．

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45．A．flamesB．smokeC．waterD．steam
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