After a short rest, the doctor carried on the next patient

A. operating B. operation on

C. do an operation on D. operating on

D 【解析】句意：短暫休息一段時間后，那位醫(yī)生繼續(xù)為下一位病人做手術(shù)。operate on=do an operation on“給……做手術(shù)”，carry on doing sth繼續(xù)做某事，故選D。
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