◎ 题干
Mr and Mrs Smith _______ busy _______ their housework.
[     ]
A. is; with    
B. are; with    
C. is; do            
D. are; do
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Mr and Mrs Smith _______ busy _______ their housework.[ ]A. is; with B. are; with C. is; doD. are; do…”主要考查了你对  【系动词】【介词】  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。