问题补充：
The old building still looks beautiful. It is about .
A. twelve-metre-high
B. twelve-metre high
C. twelve-metres-high
D. twelve metres high
答案：
A. twelve-metre-high
B. twelve-metre high
C. twelve-metres-high
(答案→)D. twelve metres high
解析：
试题分析:句意:那座古老的建筑物看起来仍然很美丽，它大约12米高，复合疑问词的构成应该是数字+连字符+名词单数，在句中充当定语；而数字+名词复数+形容词在句中通常充当的是表语，如同我们常见的She is twelve years old。=She is a twelve-year-old girl。综合这两种用法可知D正确。
考点: 考查复合形容词和单纯形容词的用法区别。
