Peter is an boy. His brother is .
- A.eight-years-old; six year old
- B.eight-year-old; six years old
- C.eight years old; six years old
- D.eight-years-old; six-year-old
答案
正确答案：B
知识点：复合形容词
复合形容词由连字符连接“基数词-计量单位词(单数)-形容词(long/wide/high/deep/old)”在句子中可以作定语；“基数词+计量单位词(复数)+形容词”在句子中可以作表语。由句意和选项可知，Peter是一个八岁大的男孩，缺少一个定语，他的弟弟六岁大了，缺少一个表语。所以正确答案为B。
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