请高手回答,单选:__________ his examination of the patient,the doctor wrote out a prescriptionA Having finishedB FinishingC FinishedD Having been finished问题:1、翻译此句 2、答案是A,为什么?

问题描述:

请高手回答,单选:__________ his examination of the patient,the doctor wrote out a prescription
A Having finishedB FinishingC FinishedD Having been finished问题:
1、翻译此句
2、答案是A,为什么?