I＇ve come to find someone, but I＇m not sure   （）     is the one I want to find.

题目解析[C]：这道题考察的是名词性从句的用法。主句为："I've come to find someone, but I'm not sure ______ is the one I want to find." 从句需要填入一个关系代词来引导名词性从句，充当从句的主语。在这个句子中，从句的引导词需要代替"someone"，所以应该选择"C"，"who"，表达的意思是"谁是我想找的那个人"。