I am , and I have a sister.
- A.13 year old;16-year-old
- B.13 years old;16-years-old
- C.13-year-old;16 years old
- D.13 years old;16-year-old
答案
正确答案:D
知识点:复合形容词

13 years old表示13岁大,可以用来做表语,16-year-old表示16岁大,但用来做定语。结合语境可知此题应该选D。

略
