WHEN I _________ THIS MORNING , MY ROOMMATE ______ ALREADY .A. WOK...

12. - KIEM TRA 1TIET SO 1 TRON 4 DE
KIEM TRA 1TIET SO 1 TRON 4 DE
12. When I _________ this morning , my roommate ______ already .A. woke / had left B. am waking / leaves C. was waking / left D. wake / has left