Question

Although he is only a __________ boy, he knows a lot.

A．five-year old

B．five-year-old

C．five years old

D．five-years-old

Answer 1

B

试题分析：句意：。虽然他只是一个五岁的男孩，但他知道很多。所填词在句中作定语，修饰名词boy，该用形容词，five-year-old是形容词，其中的名词year用单数形式；five years old通常不用于修饰名词，所以选B。