the baby is about ____.a.eight month old b.eight-month-old c.eight monthes old d.eight months old

题目

the baby is about ____.a.eight month old b.eight-month-old c.eight monthes old d.eight months old

答案

D
就想The boy is eight years old.
不能选B.该结构只能放在名词前,修饰名词.an eight-month-old baby.