— The terrible accident is under investigation.

— Actually, quicker action ____ those workers trapped in the mine. [ ]

A. might have saved

B. must have saved

C. ought to have saved

D. should have saved

对矸石山轨道运输线路，要纳入斜坡安全检查组的日常检查范围，发现问题及时汇报、解决。