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一道纠结的英语选择题The last few decades____environmental disasters on

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一道纠结的英语选择题
The last few decades____environmental disasters on a grand scale,and experts are predicting far worse to come.
A.saw B.have seen C.is seeing D.sees
但是感觉不妥啊,主语是时间,尽管说是few decades ,谓语不是应该用单数吗?
一道纠结的英语选择题The last few decades____environmental disasters on
decade是单数,它是可数名词,有了few就证明是可数名词,且decade后又加了s更说明主语是复数.所以谓语一致也应用复数.