10 years old 与10-year-old的区别

题目

10 years old 与10-year-old的区别
同题.
e.g.Although Mr.Li is a ____ man,he is in good health.
A.10 years old B.10-year-old
此题选B

答案

B
10-year-old是复合形容词,它只能作定语,且里面的名词必须都用单数