How old is the baby? He is __. A:six month old B:six-month-old C:six-months-old D:six months old

问题描述:

How old is the baby? He is __. A:six month old B:six-month-old C:six-months-old D:six months old
我选的是B 为什么答案是D

答案当然是D.
six-month-old是复合形容词,只做定语,修饰名词.
six months old才做可以做句子的表语(放在be动词之后).
且:He is six months old.
= He is a six-month-old baby.