— The terrible accident is under investigation．
— Actually, quicker action _____ those workers trapped in the mine．
A．might have savedB．must have saved
C．should have savedD．could have saved
D
考查情態(tài)動詞及虛擬語氣。might have done 對過去可能性的推測，must have done對過去肯定的推測，should have done本應(yīng)該做某事，實際上沒有做，could have done本可以做某事，實際上沒做，根據(jù)句意更快的行動本可以救那些困在礦中的工人的。所以選D。
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