◎ 题干
His mum        ill last week.    
[     ]
A. isn't      
B. wasn't    
C. aren't    
D. weren't
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“His mumill last week.[ ]A. isn't B. wasn'tC. aren't D. weren't…”主要考查了你对  【系动词】【一般过去时】  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。