20．The Winter and the Summer Olympics are held every four yearsona regular basis．

分析 冬奧會和夏季奧運會通常都是每四年定期舉辦一次．

解答 答案：on 考查單詞填空．on a regular basis意為"定期地"，是固定搭配．

點評 考查單詞填空，準確地理解題意、然后根據(jù)題意及提示確定所填單詞形式，正確寫出單詞完成答題．

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