1.over the past one hundred years.over换成in有什么区别?past换成last有什么区别?one可以换成a one或a可以不加吗?加与不加有什么区别?2.adding an extra lane to a clogged highway only worsen congestion.to a clogged highway是
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![1.over the past one hundred years.over换成in有什么区别?past换成last有什么区别?one可以换成a one或a可以不加吗?加与不加有什么区别?2.adding an extra lane to a clogged highway only worsen congestion.to a clogged highway是](/uploads/image/z/10332071-71-1.jpg?t=1.over+the+past+one+hundred+years.over%E6%8D%A2%E6%88%90in%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%3Fpast%E6%8D%A2%E6%88%90last%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%3Fone%E5%8F%AF%E4%BB%A5%E6%8D%A2%E6%88%90a+one%E6%88%96a%E5%8F%AF%E4%BB%A5%E4%B8%8D%E5%8A%A0%E5%90%97%3F%E5%8A%A0%E4%B8%8E%E4%B8%8D%E5%8A%A0%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%3F2.adding+an+extra+lane+to+a+clogged+highway+only+worsen+congestion.to+a+clogged+highway%E6%98%AF)
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