who are you waiting for? The docyor -----

who are you waiting for? The doctor -----

A to operate on the patient
B who is being operated on
C to have an operation
D who is having an operation

选择D

-你在等谁？
-正在做手术的那名医生。

解释：
who引导定语从句，修饰先行词doctor。

D who is having an operation 正在做手术的医生