the surgeon's advice was that the patient()at once( )中为什么选be operated on,而不选 was operated on?

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the surgeon's advice was that the patient()at once
( )中为什么选be operated on,而不选 was operated on?

这里是虚拟语气表示规定,建议,动词用原型

was表示已经做完手术
be表示医生说话的时候病人还没做手术