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According to scientists at the University of Alaska, while the surface temperature of the globe has risen over the last century by about one degree Fahrenheit, the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees.
(A) the surface temperature in Alaska, Siberia, and northwestern Canada has increased in the previous thirty years by about five degrees
(B) the surface temperature in Alaska, Siberia, and northwestern Canada has increased over the last thirty years by about five degrees
(C) there was an increase in the last thirty years by about five degrees in Alaska, Siberia, and northwestern Canada
(D) it had increased in Alaska, Siberia, and northwestern Canada by about five degrees over the previous thirty years
(E) it has increased in Alaska, Siberia, and northwestern Canada over the previous thirty years by about five degrees
这道题我选错了，选了A，答案是B，请问如果把in the previous（注释里说这个短语一定要用过去式）改成over the previous可以用完成时态了吗？当然，如果不考虑平行问题的话
我觉得有可能是因为previous这个词的原因，就像originally似的就得用一般过去时。但in/over the last 30 years其实是都应该用现在完成时的。
个人意见，仅供参考。
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