BY THE TIME WE ________, ALL OUR CLASSMATES _____________. A. HAD A...

7. - KIEM TRA 45 PHUT CHUAN CHI IN
KIEM TRA 45 PHUT CHUAN CHI IN
7. By the time we ________, all our classmates _____________. A. had arrived/ left B. arrived/ had left C. arrived/ leaving D. arrived/ have left