Li ping’s brother is an boy. A．eighteen-...

Li ping’s brother is an boy.

A．eighteen-years-old	B．eighteen years old
C．eighteen-year-old	D．eighteen year old

C 【解析】此题重点考查合成形容词的基本构成；因8的第一个音素是元音音素，故不定冠词用an.

考点分析：

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