57. I am sure you will excuse me _____ not telling you ahead of time.

A．from

B．for

C．since

D．At、

术后为消灭死腔防止形成血肿选用的包扎是()

A．四夹带

B．交叉十字绷带

C．颈部绷带

D．颅颌弹性绷带

E．颈腋“8”字绷带