Proper first aid can save a seriously injured person.especially when he or she i

Proper first aid can save a seriously injured person，especially when he or she is bleeding heavily or______.

A.has poisoned                                  B.was poisoned

C.has been poisoned                           D.is poisoning

试题答案

C

解析:

本题考查现在完成时。从语境可知，应当用现在完成时的被动语态。