during与in的区别After the establishment of a number of national reserves in Tibet (in) the past two decades,the population of many wildlife species has been increasing.为什么不用during?用了during就要把现在完成时改成过去式吗?
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![during与in的区别After the establishment of a number of national reserves in Tibet (in) the past two decades,the population of many wildlife species has been increasing.为什么不用during?用了during就要把现在完成时改成过去式吗?](/uploads/image/z/13493829-21-9.jpg?t=during%E4%B8%8Ein%E7%9A%84%E5%8C%BA%E5%88%ABAfter+the+establishment+of+a+number+of+national+reserves+in+Tibet+%28in%29+the+past+two+decades%2Cthe+population+of+many+wildlife+species+has+been+increasing.%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E7%94%A8during%3F%E7%94%A8%E4%BA%86during%E5%B0%B1%E8%A6%81%E6%8A%8A%E7%8E%B0%E5%9C%A8%E5%AE%8C%E6%88%90%E6%97%B6%E6%94%B9%E6%88%90%E8%BF%87%E5%8E%BB%E5%BC%8F%E5%90%97%3F)
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