SHE HAS WORKED AS A SECRETARY _________ SHE GRADUATED FROM COLLEGE....

6. - TUYEN TAP 5 BAI TEST TIENG ANH LOP 12 CO DAP AN VA GIAI THICH
TUYEN TAP 5 BAI TEST TIENG ANH LOP 12 CO DAP AN VA GIAI THICH
6. She has worked as a secretary _________ she graduated from college.A. since B. while C. before D. until