单选题   When patients spend extended periods in hospital, they tend to become overly dependent and lose interest in taking care of themselves.
 
【正确答案】 A
【答案解析】 overly过度地；extremely非常，极端地；exclusively唯一地，专有地；exactly精确地；explicitly明确地。根据句意，长期住院的病人会变得过度依赖，故选A。