how long is it since Beijing International Film Festival ope

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how long is it since Beijing International Film Festival opened?
这句话前面为什么用is而不是has been?不是说since前用完成时吗?为什么这道题不是呢
回答的时候,最好第一说这句话的翻译,然后再解释原因,

问的是两件事儿,不是问北京国际电影节开始有多久了,是问从电影节开始,另外那件事儿有多久.电影节开始只是个时间状语.

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