这里的has changed 表示的是过去某段时间开始一直延续到现在的动作 现在完成时
现在完成时与一般过去时的区别：
1.前者表示过去动作对现在的影响,后者表示过去动作的事实
2.前者表示的动作开始的动作延续到现在,后者表示过去延续了一段的动作已停止
是的 有since 就要用 现在完成时
Our home town ________ a lot since i left in 1995
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