There is boy in the corner.
A. a 11 years old
B. a 11-year- old
C. an 11-years- old
D. an 11-year-old
网友回答
A. a 11 years old
B. a 11-year- old
C. an 11-years- old
(答案→)D. an 11-year-old
解析：本题缺修饰boy作定语的形容词，而合成形容词中的名词应用原形，即11-year-old；11（eleven）是以原音开头的词，其前应用冠词an，故选D。