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It is said in the book that Thomas Edison (1847—1931) ________ the world-leading inventor for sixty years.
A.would beB.has beenC.had beenD.was
D
根据括号内的1847—1931可知,此处应填过去时态;另外,由于没有另一个过去的时间或动作与之比较,故不能用过去完成时,即只能选D。
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