用一般过去时态,因为两位发明家都已经过世了.你没有把句子说完整,不过我可以补充.据我所知BENJAMA FRANKLIN他用放飞风筝来证明雷是电,他发明了FRANKLIN STOVE(炉）,BIFOCAL（双层镜）LIGHTNING RODS.还有很多关于他...
Franklin_electricity,but Edison_the electric light bulb.用什么时
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