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

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问题 It is said in the book that Thomas Edison (1847~1931 ) ______ the world leading inventor for sixty years.

选项 A、would be
B、has been
C、had been
D、was

答案D

解析 A项为过去将来时,表示“过去的将来”;B项为现在完成时,表示到现在为止,一直”;C项为过去完成时,表示“在过去一段时间一直”;D项为一般过去时,表示“过去是”。由于时间状语没有表明60年的具体时间,故排除C。A、B不符合题意。
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