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对比两个句子时态:1.Inthepastfiveyears,China'secomomicgrowthrateovertookthatofmanydevelopedcountries.2.Inthepastfiveyears,America'seconomicgrowthrateisslowerthanthatofChina.问:Inthepastfiveyears是表过去

题目详情
对比两个句子时态:
1.In the past five years,China's ecomomic growth rate overtook that of many developed countries.
2.In the past five years,America's economic growth rate is slower than that of China.
问:In the past five years是表过去的时间状语,第一个句子用overtake的过去时,但第二个句子为什么用 is



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答案和解析
第二句句子用过去式或者一般现在时都是可以说通的.
过去式就不解释了.
如果是用一般现在式,那么is表示的就是客观事实.在过去的5年里,美国经济发展率比中国慢,这是个事实,所以可以用一般现在式.