题目内容
5．据我所知，汤姆已离开两周了．As far as I know，Tomhas been away for two weeks．
分析 has been away．
解答 答案：has been away．结合句意离开这个动作发生在过去，已经持续了一段时间，故用现在完成时have/has+过去分词，离开leave是短暂性动词，不能与一段时间for two weeks连用，换成be away，主语是Tom三单，故has，be的过去分词been，故答案是has been away．
点评 现在完成时表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在．它的构成是：主语+have/has+动词的过去分词．
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ZhongWei，a 46-year-old husband and father has lived in Wenzhou for the last 13 years by （67）himself．With a hard job in a crayon factory，he doesn't find （68）much time to visit his hometown．"I used to return home at least once a year，but I haven't been back for almost （69）three years now，it's a shame，but I just don't have the time．"he says．
Many people like ZhongWei regard with great （70）interest how their hometowns have changed．Perhaps large hospitals and new roads have appeared．Their hometowns have become （71）better than before．In many places，the government has also built new schools and sent teachers from the cities to help．
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According to ZhongWei，however，some things will never change．"In my hometown，there was a big old tree opposite the school．It is still there and has become quite a symbol of the place．Most of the children in my time liked to play together under that big tree．（74）especially during the summer holidays．It was such a happy childhood．Our hometown has left many soft and sweet （75）memories in our hearts．How he wishes that he could come back his hometown now．
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