题干
I know Simon is __________ boy. He can swim and ride.
A：a 11-year-old
B：an 11-year-old
C：a 11-years-old
D：an 11-years-old
答案(点此获取答案解析）
B
I know Simon is __________ boy. He can swim and ride.
A：a 11-year-old
B：an 11-year-old
C：a 11-years-old
D：an 11-years-old
