◎ 题干
Don't go to open the door at once when the door bell _____.You should ask who it is at first.       
[     ]
A. run off    
B. set off    
C. go off      
D. put off
◎ 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“Don't go to open the door at once when the door bell _____.You should ask who it is at first.[ ]A. run off B. set off C. go offD. put off…”主要考查了你对  【动词短语】  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。