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
His doctor reassured him that the new medicine was ______ of poi
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