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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• 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___inreased enormously ever since.A.is B.was C.has been D.had been我选了C 是因为前后两句时态并列都是过去吗?
• Tom won the first prize in the race,so ran the _____ of all
• believe it or not,jack came out first in 500 metres race.first 为什么不加the ,