73、______ his examination of the patient,the doctor wrote out a prescription.A：Having finished
问题描述：
73、______ his examination of the patient,the doctor wrote out a prescription.A：Having finished
A：Having finished?为什么
A：Having finished
B：Finishing
C：Finished
D：Having been finished
答
主语是医生,这句话是说医生已经完成检查,因此是主动且完成的形式~