Our Chinese teacher has a ( )son.

问题描述:

Our Chinese teacher has a ( )son.
A、5 years old
B、5-years-old
c、5-yesr-old
D、5 year old
原因

c、5-yesr-old
这是合成形容词,要注意:
1.要用连字符
2.不能用复数(year)