__________ DO YOU STUDY IN THE LIBRARY AFTER SCHOOL

13. - 500 CAU TRAC NGHIEM THI VAO LOP 6 MON TIENG ANH
500 CAU TRAC NGHIEM THI VAO LOP 6 MON TIENG ANH

13. __________ do you study in the library after school? - Once a week.

A. How often B. How far C. How many D. How long