在新概念三：L45，第15行（以下是句子），请问which引导什么从句，分析一下，谢谢！
But,theysuddenlybecametheparentsofquintuplets,fourgirlsandaboy,aneventwhichradicallyc...
But, they suddenly became the parents of quintuplets, four girls and a boy, an event which radically changed their lives.
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