◎ 题干
______ we can't remove our troubles in life for ever, we can leave them behind when we are on vacation.
[      ]
A. When      
B. While      
C. Unless    
D. Until    
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“______ we can't remove our troubles in life for ever, we can leave them behind when we are on vacation. [ ]A. WhenB. While C. UnlessD. Until…”主要考查了你对  【从属连词】  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。