问题补充:
Zhang Yu is a girl from Sichuan.
A. twelve years old
B. twelve-year old
C. twelve–years-old
D. twelve-year-old
答案:
A. twelve years old
B. twelve-year old
C. twelve–years-old
(答案→)D. twelve-year-old
解析:此题考查合成形容词的基本构成,根据语境可知张宇是个来自四川的一个12岁的小女孩,故选D。