It is said in the book that Thomas Edison (1847—1931) ______

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It is said in the book that Thomas Edison (1847—1931) ________ the world-leading inventor for sixty years.

A．would be

B．has been

C．had been

D．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。

It is said in the book that Thomas Edison (1847-1931) ______ It is said in the book that Thomas Edison(1847-1931)______th 1）It is said in the book that Thomas Edison (1847-1931)_____ It is said in the book that Thomas Edison(1874-1931)the worl It is said in the book that Thomas Edison ( )the world leadi It is said in the book that Thomas Edison (.) the world-lead It is said in the book that Thomas Edison ___the world leadi It is written in the book that Thomas Edison ____the world's It is said in the book Tmomas Edison(1847-1931)____the world It is said in the book that Tomas Edison __________ the worl Thomas Edison is one of_____(famous)______(invent)in the wor It was Thomas Alva Edison who ______ the electric lamp.