问题描述：
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
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
问题解答：
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