THEY START THEIR WORK ... 8 AM.A. IN B. AT C. ON D. FROM

6. - 2 DE DAP AN KIEM TRA KI I TIENG ANH 8 20132014
2 DE DAP AN KIEM TRA KI I TIENG ANH 8 20132014

6. They start their work ... 8 am.

a. in

b. at

c. on

d. from