Nick is my classmate. I’ve known him for a long time.

A. Nick, who is my classmate, I’ve known for a long time.

B. Nick who is my classmate I’ve known for a long time.

C. Nick, that is my classmate, I’ve known for a long time.

D. Nick which is my classmate I’ve known for a long time.

E9- TĐ- Unit 9 (1)