单选题 He said that the medicine the doctor gave him brought ______ to his headache.
【正确答案】 C
【答案解析】[解析] retreat vi.“撤退,退却”。recovery n.“康复,痊愈”。relief v.“减轻,减缓,免除,救济,安慰”。relaxation n.“放松,休闲,缓和,减轻”。