HÃY CHỌN MỘT ĐÁP ÁN ĐÚNG NHẤT (A, B, C HOẶC D) CHO MỖI CÂU SAU

79. When the doctors________ at the scene of the accident, they ________ victims still ________.

A. arrived / realized / were breathing B. were arriving / realized / breathed

C. arrived / had realized / breathed D. were arriving / were realizing / were

breathing