题干
I don't believe that boy can sing so well.
A：a 8-year-old
B：a 8-years-old
C：an 8-years-old
D：an 8-year-old
答案(点此获取答案解析）
D
I don't believe that boy can sing so well.
A：a 8-year-old
B：a 8-years-old
C：an 8-years-old
D：an 8-year-old
