The man has a son.
A. five year old B. five-years-old
C. five years old D. five-year-old
The man has a son.
A. five year old B. five-years-old
C. five years old D. five-year-old
D 本题考查合成形容词的结构，中间用连字符，名词用单数形式。句意：那个男人有一个五岁的儿子。