◎ 题干
Mr. Black used to be busy. But now he’s tired and      , so he has plenty of time to exer­cise.
A.hard B.calm
C.freeD.nervous
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Mr. Black used to be busy. But now he’s tired and, so he has plenty of time to exer­cise.A.hard B.calm C.freeD.nervous…”主要考查了你对  【助动词】【介词短语】【固定搭配】【疑问词组】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。