My name is Guo Ping. We are in the same school.A. friendB. friends　　C. friend’sD. friendl

问题补充：

My name is Guo Ping. We are in the same school.

A. friend

B. friends

C. friend’s

D. friendly

答案：

A. friend

B. friends

(答案→)C. friend’s

D. friendly

解析：修饰名词的名词通常用名词所有格，表示人的通常在名词后加’s，故本题选C。