Question

— 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

Answer 1

D
考查情態(tài)動(dòng)詞及虛擬語(yǔ)氣。might have done 對(duì)過(guò)去可能性的推測(cè)，must have done對(duì)過(guò)去肯定的推測(cè)，should have done本應(yīng)該做某事，實(shí)際上沒(méi)有做，could have done本可以做某事，實(shí)際上沒(méi)做，根據(jù)句意更快的行動(dòng)本可以救那些困在礦中的工人的。所以選D。