◎ 题干
He started walking when he was ______.
[     ]
A. 2-year-old    
B. 2 year old    
C. at age of 2    
D. 2 years old
◎ 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“He started walking when he was ______.[ ]A. 2-year-oldB. 2 year oldC. at age of 2D. 2 years old.…”主要考查了你对  【可数名词(单数名词,复数名词)】  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。