Dr.Bethune was busy ( )the wounded? A.operatingB.operateC.operate atD.to operate in

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Dr.Bethune was busy ( )the wounded? A.operatingB.operateC.operate atD.to operate in
Dr.Bethune was busy ( )the wounded? A.operatingB.operateC.operate atD.to operate in

Dr.Bethune was busy ( )the wounded? A.operatingB.operateC.operate atD.to operate in
be busy doing(忙于做某事)〈固定短语〉
选A