His doctor reassured him that the new medicine was ____ of poiso

His doctor reassured him that the new medicine was ____ of poisonous components.
A、released
B、cleansed
C、relieved
D、cleaned
【正确答案】：B
【题目解析】：released释放；cleansed清洗；relieved减轻，解除；cleaned打扫。句意：他的医生向他保证这种新药已清除了有毒成分。