My brother has a daughter. She’s kind and lovely.
A. four-years-old
B. four-year-old
C. fourth-year-old
D. four-year-olds
网友回答
A. four-years-old
(答案→)B. four-year-old
C. fourth-year-old
D. four-year-olds
解析：复合形容词的表示方法是“数字+量词+形容词”，这里的数字应该用基数词，名词用单数，形容词后不能加s。所以本题选B。