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
C
本題考查現(xiàn)在完成時(shí)。從語(yǔ)境可知，應(yīng)當(dāng)用現(xiàn)在完成時(shí)的被動(dòng)語(yǔ)態(tài)。
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