—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

患下列哪些疾病不能参加接触直接入口食品的工作（）。

A、痢疾、伤寒

B、病毒性肝炎和活动性肺结核

C、化脓性和渗出性皮肤病

D、流行性感冒