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As we all know ,Columbus          America and Edison         light bulbs.
A.discovered ; inventedB.invented ; discovered
C.discovered ; discoveredD.invented ; invented
A

试题分析:句意:我们都知道,哥伦布发现了美洲,爱迪生发明了电灯。discover发现,原来就有后来被人们发现; invent发明,创造以前没有的东西,根据句意,故选A
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