答案：has passed
1.since引导时间状语从句时,从句使用一般过去时,则主句使用现在完成时.
2.主谓一致有一个相关的语法规定如下：
如果表示时间、数目、距离、价格、重量等名词复数做句子主语,且视为一个整体看待时,则谓语动词使用单数形式.
另：past不是动词pass的过去分词修饰,它只是一个介词或副词.
所以正确答案是：has passed.
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