◎ 题干
If you feel tired out and unable to think clearly,that is________you have to get a rest.
[     ]
A. why  
B. when  
C. whether  
D. what
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“If you feel tired out and unable to think clearly,that is________you have to get a rest.[ ]A. whyB. whenC. whetherD. what…”主要考查了你对  【连接副词】  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。