YOU NEEDN’T…………THE MONEY BACK FOR A YEAR.A. WORKS B. HAS WORKEDA....

13. - 30 BAI TRAC NGHIEM VOI KEYS FOR 9 P
30 BAI TRAC NGHIEM VOI KEYS FOR 9 P

13. You needn’t…………the money back for a year.

A. works B. has worked

A. to pay B. pay

C. is working D. was working

C. paid D. be paid