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7．中國最年輕的城市三沙市建立于2012年6月21日．
Sansha，the youngest city of China，was set/built up on June 21st，2012．

分析 Sansha，the youngest city of China，was set/built up on June 21st，2012．

解答答案：was set/built
根據題意三沙市建立于2012年6月21日，可知 build sth up建立，開發 set up建立．三沙市應該是被建立，所以用被動語態be+動詞的過去分詞形式．結合句中時間，可知是過去建立的，因此用一般過去時態，was built/set．

點評牢記固定搭配build sth up建立，開發 set up建立．注意句中時態，謂語動詞的正確使用．

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