-----When did the Party ?-----In 1921.A. came into beingB. come into beingC. come onD. com

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A. came into being
(答案→)B. e into being
C. e on
D. e about
解析：came into being形成，产生；e into being形成，产生；e on开始，上演；e about发生，改变。句意：这个党是什么时候成立的？——在1921年。前文已有助动词did，故行为动词用原形，选B。