Our home town ________ a lot since i left in 1995

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Our home town ________ a lot since i left in 1995
空里填的为什么是 has changed
而不是 was chanded (被改变)呢
是不是 since 决定了用完成时态呢

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 Since ________ in this school,I have learn a lot of Chinese. Our school has changed a lot since I left it 为什么,has用原形,而不用过 ( ) 5.Now the air in our home town is ________ than it was b there are a lot of ________ (activity) in our school Is there a lot of rain in your home town in summer?同义句 It _____ a lot since I left the city.A.is changing B.changes our town has a big zoo with a lot of anlimals in Our town has a big zoo with a lot of animals in 翻译:Our town has a big zoo with a lot of animals in it. 1、Great changes _________ in my home town since 1980. Now there're a lot of f____ in our town and many workers are