Thesedoctorsarebusydayandnight,acureforAIDS.
A.bringing onB.pulling onC.taking onD.working on在线课程D
动词短语辨析。bring on引起, 使发展, 提出；穿上；pull on继续拉；穿上；take on雇佣，呈现，承担；work on从事于，进行；句意：那些医生日夜忙碌，进行对艾滋病的治疗。
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