◎ 题干
—Would you like to go bike riding with us tomorrow ?  
—Sure , ______ I am busy .
[     ]
A. since    
B. unless    
C. when      
D. until
◎ 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“—Would you like to go bike riding with us tomorrow ?—Sure , ______ I am busy .[ ]A. since B. unless C. whenD. 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。