◎ 题干
Dogs are clever animals and they can be trained to ________ houses.
[     ]
A. look for      
B. watch
C. watch out      
D. watch out for
◎ 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“Dogs are clever animals and they can be trained to ________ houses. [ ]A. look forB. watchC. watch out D. watch out for…”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。