◎ 题干
If you are not yet            , you are forbidden to visit this site .
A.eighteen years B.at age of eighteen
C.eighteen – year-old D.eighteen years of age
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“If you are not yet , you are forbidden to visit this site .A.eighteen years B.at age of eighteen C.eighteen – year-old D.eighteen years of age…”主要考查了你对  【可数名词及其单复数】【集合名词】【名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。