BY THE TIME THE BOSS __________ AT 9 A.M, HIS EMPLOYEES ___________ FO...

câu 18: - DE THI HOC KY 2 MON TIENG ANH LOP 12 TRUONG THPT TRAN HUNG DAO TP HO CHI MINH NAM HOC 2016 2017 CO DAP AN
DE THI HOC KY 2 MON TIENG ANH LOP 12 TRUONG THPT TRAN HUNG DAO TP HO CHI MINH NAM HOC 2016 2017 CO DAP AN
Câu 18:By the time the boss __________ at 9 a.m, his employees ___________ for four hours.A.has arrived/ were working B. arrived/ have been workingC.arrives/ will have been working D.will arrive/ are working