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【题目】Jack in the lab when the power cut occurred.
A.works
B.has worked
C.was working
D.would work

【答案】C
【解析】题目考查时态。句意:突然断电时,杰克正在实验室里工作。根据occurred可知,这里指过去发生的事情,断电时,杰克正在工作,综合用过去进行时,故选C。

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