◎ 题干
If anything __________the machine, please let us know.  
[     ]
A. happens on        
B. happens to  
C. happened on        
D. happen to
◎ 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 anything __________the machine, please let us know. [ ]A. happens on B. happens to C. happened onD. happen to…”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。