BY THE TIME I...THE ROOM, I HAD TURNED OFF ALL THE LIGHTS. A. WAS...

1. - KIEM TRA 15 PHUT SAU BAI 5 6 7
KIEM TRA 15 PHUT SAU BAI 5 6 7

1. By the time I...the room, I had turned off all the lights.

A. was leaving

B. had left

C. left

D. have left