问题补充：
-----When did the Party ?
-----In 1921.
A. came into being
B. come into being
C. come on
D. come about
答案：
A. came into being
(答案→)B. come into being
C. come on
D. come about
解析：came into being形成，产生；come into being形成，产生；come on开始，上演；come about发生，改变。句意：这个党是什么时候成立的？——在19。前文已有助动词did，故行为动词用原形，选B。
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