◎ 题干
Our government has taken some measures to overcome the    lack of electricity, but it may take
some time ____ we   have enough power.    
[     ]
 A. since            
B. after        
C. unless    
D. before
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Our government has taken some measures to overcome thelack of electricity, but it may takesome time ____ we have enough power.[ ]A. sinceB. after C. unlessD.…”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。