It is said in the book that Thomas Edison ___the world leadi

It is said in the book that Thomas Edison ___the world leading inventor for sixty years
A would be B has been C had been D was

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goto99 幼苗

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C
一直持续了60年,过去完成时

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韩猪手幼苗

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B. It's said that...是主句，从句可用任何时态．这里用现在完成时表示强调．

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穿西服的狼幼苗

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c
由said可看出是过去试，已完成，则用完成试

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randh 幼苗

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B.根据主从时态一致，应采用现在时，再根据for 60 years要采用完成式，两者结合，采用现在完成时。

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