One of the suspects is _________ boy.
A. a 18-year-old B. an 18-years-old
C. a 18 years old D. an 18-year-old
One of the suspects is _________ boy.
A. a 18-year-old B. an 18-years-old
C. a 18 years old D. an 18-year-old
D 18-year-old作定语,其中的year用单数形式。