Linda is thirteen old. She is my friend.A. a yearB. the yearC. yearsD. year

问题补充：

Linda is thirteen old. She is my friend.

A. a year

B. the year

C. years

D. year

答案：

A. a year

B. the year

(答案→)C. years

D. year

解析：句意：琳达是十三岁。她是我的朋友。在英语中表示年龄常用数词+years old，所以选C。