单选题
Three days later, the IOC announced that Johnson's test had been positive and he had disgraced the sports movement.
【正确答案】
A
【答案解析】该句意为：三天后，国际奥委会宣布约翰逊的尿检呈阳性并称他玷污了这项体育活动。disgrace：玷污，使……蒙受耻辱；dishonor：玷污，使蒙羞；destroy：破坏；discriminate：歧视；disguise：伪装，掩饰。