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【题目】The machine has been used many years. It’s no wonder that it doesn’t work well________.

A. regularly B. constantly

C. occasionally D. frequently

【答案】C

【解析】

试题分析:A. regularly定期地,B. constantly 连续地,不断地,C. occasionally偶尔地,D. frequently经常地,句意:这个机器已经被使用了很多年,难怪它偶尔不工作了。所以选C

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