BY THE TIME HE ARRIVED, ALL HIS CLASSMATES……… .A. HAD LEFT B. LEFT...

4. - DE KIEM TRA GIUA HKI TANH 10 VA DAP AN
Tiếng Anh DE KIEM TRA GIUA HKI TANH 10 VA DAP AN
4. By the time he arrived, all his classmates……… .A. had left B. left C. have left D. leave