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umm...so...这是一个很简单的问题, but i really don't want to go and start my homework...so yeah...

一名罪犯被带到两扇门前，一扇门通往自由,另一扇则通回罪犯的囚室.每一扇门前都有一名看守,他们一个永远都说实话,另一个永远都说谎话.罪犯只能问一个问题, 向往自由的他到底该问什么呢?