The first use of atomic weapons was in 1945,and their power __ increased enormously ever since这里为什么用has been 而不是用had been

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Thefirstuseofatomicweaponswasin1945,andtheirpower__increasedenormouslyeversince这里为什么用hasbeen而不是用hadb

The first use of atomic weapons was in 1945,and their power __ increased enormously ever since这里为什么用has been 而不是用had been
The first use of atomic weapons was in 1945,and their power __ increased enormously ever since
这里为什么用has been 而不是用had been

The first use of atomic weapons was in 1945,and their power __ increased enormously ever since这里为什么用has been 而不是用had been
ever since 要求句子必须用现在完成时,意思是“自从那时起一直到现在”.

has been是现在完成时,是说从过去那时到现在
had been是过去完成时,是说从过去那时到过去的另一个时刻
这里显然只有一个过去的时间,用现在完成时。

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