Thomas Edison ----the world leading inventor for sixty years选had been 还是was?why?是

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Thomas Edison ----the world leading inventor for sixty years选had been 还是was?why?是
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Thomas Edison ----the world leading inventor for sixty years选had been 还是was?why?是
Thomas Edison ----the world leading inventor for sixty years选had been 还是was?why?是

Thomas Edison ----the world leading inventor for sixty years选had been 还是was?why?是
had been因为后有跟时间状语.FOR 60 YEARS.如果没有持续60年这个时间段,就选WAS.

had been

has been 因为后面有for sixty years,表示一段时间内

应该选was，如果选had been那么这句话的时间应该是last sixty years如果用had been那表示从那时至今还是如此，而这个事实现在已经不可能是这样了．不知明白了没有．

was 表示是过去的事实

was
因为已经是过去的一个事实了
并且had been 和was都是持续性的动词,但是had been 有表示过去完成的含义,但是这个句子的意思侧中于说明这个事实而以
所以我觉得应该是was

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