◎ 题干
The two dogs were used to_______ in this strict way and they were once used to _____ prisoners
who had run away from prison.
[     ]
A. being trained, search for    
B. being trained, looking for
C. be trained, search for        
D. training, look for
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The two dogs were used to_______ in this strict way and they were once used to_____ prisoners who had run away from prison.[ ]A. being trained, search for B. …”主要考查了你对  【动词短语】【动名词的被动式】  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。