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填空题
Before the clock was invented, there was not a universal reference of time.____
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解析：
由题干中关键词“the clock”定位至B段。本段讲到在还没有时钟之前，人们计时的依据之一是太阳；然后接着讲到，只有本地时间，没有通用的参照时间（no universal river of time）。故匹配段落为B段。
由题干中关键词“the clock”定位至B段。本段讲到在还没有时钟之前，人们计时的依据之一是太阳；然后接着讲到，只有本地时间，没有通用的参照时间（no universal river of time）。故匹配段落为B段。
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