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雅思写作常用的35组短语 二十一、For the past 时间，S 现在完成式... 例句：For the past two years, I have been busy preparing for the examination. 过去两年来，我一直忙着准备考试。 二十二、Since S 过去式，S 现在完成式。 例句：Since he went to senior high school, he has worked very hard. 自从他上高中，他一直很用功。 二十三、It pays to V ~~~ 例句：It pays to help others. 帮助别人是值得的。 二十四、be based on 例句：The progress of thee society is based on harmony. 社会的进步是以和谐为基础的。 二十五、Spare no effort to V We should spare no effort to beautify our environment. 我们应该不遗余力的美化我们的环境。 | 
