英语填介副词The doctors think that the patient should be operated __ again.

英语填介副词The doctors think that the patient should be operated __ again.
英语填介副词
The doctors think that the patient should be operated __ again.

英语填介副词The doctors think that the patient should be operated __ again.
on

on.
这个医生认为病人必须马上再次动手术

operate on sb给某人做手术