— The terrible accident is under investigation．

— Actually, quicker action _____ those workers trapped in the mine．

— The terrible accident is under investigation．— Actually, quicker action _____ those workers trapped in the mine．

1. A.
   might have saved
2. B.
   must have saved
3. C.
   should have saved
4. D.
   could have saved

—The terrible accident is under investigation．

—Actually, quicker action _________ those workers trapped in the mine．

       A．might have saved  B．could have saved    

       C．should have saved    D．must have saved

—The terrible accident is under investigation．

—Actually, quicker action _________ those workers trapped in the mine．

A．might have saved                                       B．could have saved

C．should have saved                                       D．must have saved

--- The terrible accident is under investigation．

--- Actually, quicker action          those workers trapped in the mine．

A．might have saved                                        B．must have saved

C．should have saved                                       D．could have saved