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】：本题考查动词辨析。release：释放，发泄。release sb from 免除职责。cleanse：v. 清洗，清理。be cleansed of 使免除，净化。relieve：减轻。relieve sb of sth：帮助减轻负担。clean：打扫，变干净 。由题干可知动词后面的宾语是有害成分，故B选项“净化”最符合题意。句意：他的医生向他保证这种新药已清除了有毒成分。
