题目内容
20.The Winter and the Summer Olympics are held every four yearsona regular basis.分析 冬奥会和夏季奥运会通常都是每四年定期举办一次.
解答 答案:on 考查单词填空.on a regular basis意为"定期地",是固定搭配.
点评 考查单词填空,准确地理解题意、然后根据题意及提示确定所填单词形式,正确写出单词完成答题.
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