There is boy in the corner.A. a 11 years oldB. a 11-year- oldC. an 11-years- oldD. an 11-

问题补充：

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

答案：

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。