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】：cleanse v. 清洗，清理 be cleansed of 使免除，净化，release 释放，发泄 release sb from 免除职责，relieve 减轻 relieve sb of sth 帮助减轻负担，clean 打扫，变干净
