He is an boy from a small village in Guangxi. A. eight—year—old B. eight—years—old C. eig

问题补充：

He is an boy from a small village in Guangxi.

A. eight—year—old B. eight—years—old C. eight year old

答案：

解析：此题重点考查合成形容词的基本构成，数词+名词(+形容词)；合成形容词中的名词(year, hour, metre, month等)必须用单数形式。因8的第一个音素是元音音素，故不定冠词用an.