It is said in the book that Thomas Edison (.) the world-lead

It is said in the book that Thomas Edison (.) the world-leading inventor for sixty years答案在下
A would be.B has been C had been.D was

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用was表示一般过去时.即爱迪生的生平,这本书里说,爱迪生作了60年的领先的发明家.与现在无关,纯属过去.与下面的句子相似：
I stayed in Beijning for 10years .

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