One evening, while working late, Fred was startled when the lights went out. He realized a maintenance man must have shut them off, unaware that anyone else was in the building.
一天晚上他工作到很晚，当灯息灭时，福瑞德很吃惊，他知道一定是维护人员不知道大楼里还有人就把灯关了。
One evening, while working late, Fred was startled when the lights went out. He realized a maintenance man must have shut them off, unaware that anyone else was in the building.
一天晚上他工作到很晚，当灯息灭时，福瑞德很吃惊，他知道一定是维护人员不知道大楼里还有人就把灯关了。
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