It is said in the book that Thomas Edison (1847-1931) ______
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
请详细解释,谢谢
A. would be B. has been
C. had been D. was
请详细解释,谢谢
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