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2016年高考北京卷
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21.Jack in the lab when the power cut occurred.
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A. works B. has worked C. was working D. would work
【答案】C
【翻译】Jack 正在实验室工作,突然断电了。
【解析】本题考查时态。由后半句的 occurred 可知是过去的动作,根据语境可以判断,断电那会 Jack 正在工作,所以用过去进行时,答案选 C。