sat ise的一道题 marathon racing,a challenging test of endurance,
sat ise的一道题
marathon racing,a challenging test of endurance,has become increasingly popular among amateur athletes in the last few years.
这里的has become为什么是完成时?后面说的是in the last few years.那么意思是再过去的几年里,时间段是限制在过去的,现在完成时是说从过去到现在并一直在进行,那么在这里用完成时恰当么