20．All kinds of festivals and celebrations have held everywhere since ancient times．

分析 自古以來，世界各地就舉行各種各樣的節(jié)日和慶典．

解答 答案：have后加been
考查句子改錯．festivals and celebrations與hold之間是動賓關系，要用被動語態(tài)，即現(xiàn)在完成時的被動語態(tài)．

點評 單句改錯涉及詞匯、語法、句型結構等方面的知識和邏輯情理的推斷和綜合辨析能力，是一種在較高層次上考查考生對英語知識的掌握和語言綜合運用能力的測試題型．它是專門針對考生們平時學習英語過程中，尤其是寫作練習中常犯的又是較為普遍的錯誤而設計的．

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