题目内容

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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