THEY ___________FOR A MILE WHEN THEY __________THAT SOMEONE ______...

16. - TRAC NGHIEM PHAN THI TRONG TIENG ANH TONG HOP WITH KEYS TRAC NGHIEM TENSES TONG HOP
TRAC NGHIEM PHAN THI TRONG TIENG ANH TONG HOP WITH KEYS TRAC NGHIEM TENSES TONG HOP
16. They ___________for a mile when they __________that someone _______missing. A. Had walked/ had realized/ was B. had been walking/ realized/ had been C. had been walking/ realized/ was D. had walked/ had realized/ had been