◎ 题干
All the customers were warned to watch ____ for the fierce dog outside the shop.
[     ]
A. on                  
B. over                  
C. at                  
D. out
◎ 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“All the customers were warned to watch ____ for the fierce dog outside theshop.[ ]A. onB. overC. atD. out…”主要考查了你对  【介词和介词短语】  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。