题干
One of the suspects is _________ schoolboy.
A：a 18-year-old
B：a 18 years old
C：an 18-years-old
D：an 18-year-old
答案(点此获取答案解析）
D
One of the suspects is _________ schoolboy.
A：a 18-year-old
B：a 18 years old
C：an 18-years-old
D：an 18-year-old
