◎ 题干
My mother isn't in.  I must       _ my sister at home.  
[     ]
A. look after            
B. look at
C. look up            
D. look out
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“My mother isn't in.I must _ my sister at home.[ ]A. look afterB. look atC. look upD. look out…”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。