The patient ( ) at that time.A was being operated B was operating on C was operated D was being operated on为什么

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The patient ( ) at that time.A was being operated B was operating on C was operated D was being operated on为什么
The patient ( ) at that time.
A was being operated B was operating on C was operated D was being operated on
为什么

The patient ( ) at that time.A was being operated B was operating on C was operated D was being operated on为什么
D
被动语态 过去进行时时态
operate on sb:对某人手术

病人被做手术,被动
operate on sb.
at that time对应过去进行时
所以选D

选D,因为operate不及物,给人做手术要加介词on,而且病人是被手术的,应选被动语态,结合时态at that time,选过去进行时,故选d