题干
It's not safe(安全的) for an ________ child to swim in the river.
A：seven-year-old
B：seven-years-old
C：eleven years old
D：eleven-year-old
答案(点此获取答案解析）
D
It's not safe(安全的) for an ________ child to swim in the river.
A：seven-year-old
B：seven-years-old
C：eleven years old
D：eleven-year-old
