Question

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

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

Answer 1

D
情态动词用法辨析。Ａ也许会做某事；Ｂ一定做了某事；Ｃ本应该做某事；Ｄ本可以做某事；结合句意可知Ｄ正确。句意：—这个可怕的事故正在调查中。—实际上，迅速行动本可以挽救那些被困在煤矿中的工人。