The boy the fire on May 10th.
A. 18 years old, put out
B. 18-year-old, put out
C. 18 years old, putted out
D. 18-year-old, putted out
网友回答
A. 18 years old, put out
(答案→)B. 18-year-old, put out
C. 18 years old, putted out
D. 18-year-old, putted out
解析：由“数词+名词(+形容词)”构成的这种合成形容词中的名词(year, hour, metre, month等)必须用单数形式，而且只能作定语，而18 years old 只可以做表语；动词put的过去式与原形同形，故选B。