Question

He is a ________ man, but he looks younger than he is．

[　　]

A．

40 years old

B．

40-year-old

C．

40-years-old

D．

40 year old

Answer 1

答案：B
解析：

40 years old只能作表语，而40-year-old相当于形容词，在句中作定语。