问题
选择题
He started walking when he was _____.
A. 2-year-old B. 2 year old C. 2 years old
答案
答案：C
题目分析：句意：他在两岁时开始走。2-year-old两岁的，是形容词，一般作定语；2 years old两岁，是一个短语，常作表语。所以选C。
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He started walking when he was _____.
A. 2-year-old B. 2 year old C. 2 years old
答案：C
题目分析：句意：他在两岁时开始走。2-year-old两岁的，是形容词，一般作定语；2 years old两岁，是一个短语，常作表语。所以选C。