The killer insisted that she was defending herself when .A. attackB. attackedC. to attackD

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A. attack
(答案→)B. attacked
C. to attack
D. having attacked
解析：考查非谓语。句意：杀人者坚持说当他被袭击的时候他是正当防卫。When是连词，连词后要么+ doing，表主动关系，要么+ done，表被动关系，本题中主语she 和attack袭击之间是被动关系，所以B正确。