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?

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

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