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        1. 【題目】China ________ (change) a lot in the past 40 years and now it is playing an important role on the world stage.

          【答案】has changed

          【解析】

          句意:中國(guó)在過(guò)去的40年里發(fā)生了很大的變化,現(xiàn)在它正在世界舞臺(tái)上發(fā)揮著重要的作用。

          根據(jù)in the past 40 years,可知句子時(shí)態(tài)用現(xiàn)在完成時(shí),其結(jié)構(gòu)為has/have+動(dòng)詞的過(guò)去分詞;主語(yǔ)是China,第三人稱單數(shù),助動(dòng)詞用haschange的過(guò)去分詞是changed;故答案為has changed

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