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【题目】The machine has been used for man years. Its no wonder that it doesnt work well __________.

A. regularly B. constantly

C. frequently D. occasionally

【答案】D

【解析】

试题分析:考查副词的使用及句意的理解句意:这台机器已经被用过好多年了,难怪它偶尔会不好好运转。A. 有规律地; B. 不断地;C. 频繁地; D. 偶尔地,D正确。

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