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【题目】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:中国在过去的40年里发生了很大的变化,现在它正在世界舞台上发挥着重要的作用。

根据in the past 40 years,可知句子时态用现在完成时,其结构为has/have+动词的过去分词;主语是China,第三人称单数,助动词用haschange的过去分词是changed;故答案为has changed

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