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问题: 有一个题问呀,

30.christma is a holiday centering upon the family, its traditions and customs, ___ have become custios now associated as "American".
a.one of which b. either of which c. all of which d. they.
答案给,C。翻译并解释下。为什么?谢谢

解答:

圣诞节是集中在家庭,传统风俗习惯的节日,所有这些现已都成为与美国相关的习俗了。
a和b都表示单数因此不对,C是由which引导的非限制性定语从句,本身又起代词的作用。