B
根据句子的意思，本题的前半句“自从我来到这个学校已经过去了二十年”中出现的twenty years强调“二十个年头”，因此谓语用复数形式，而后半句“我觉得二十年是我人生中短暂的一段时光”，其中的twenty years则是a period of time，被看成了一个整体，因此谓语动词用单数形式。
类似的情况有：表示时间、重量、金额、距离等的复数名词作为一个整体看待时，谓语动词用单数形式，如：Twenty dollars is enough for the coat.
Twenty years _____ passed since I came to this school, but I
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