The doctor ________ his office until all the patients were well treated．A.didn’t stay inB.didn’t leaveC.leftD.waited
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B解析这句句子的意思是“这位医生直到所有的病人都得到了救治才离开办公室。”如果用瞬间动词leave，就应该是The doctor didn’t leave his office until all the patients were well treated．但是，如果用持续性动词stay，则是The doctor stayed in his office until all the patients were well treated．