I knew nothing of the motives behind his recent move, and I don't know either the person to put him up to the action.
【正确答案】 A
【答案解析】解析：固定搭配及结构应用。表示“也不……"，可用not do…either，或nor do sb．do…；因前面用的是过去时，所以本句应用nor did I know the person who…因此A为答案。