Why is the answer "will have worked" but not "will have been working"?

moon-letters were a method of writing invented by the dwarves. moon-letters were ordinary runes, but written in such a way that they could only be read when the light of the moon shone behind the writing. some moon-letters could be read by any moonlight, but it was possible to make the writing even more secret. more sophisticated moon-letters could only be read by the light of the same shape of moon, or at the same time of year, as when they were written. hope this !

yeah, i think its a good thing what do you think?

first of all, dante wanted to write an account of the search for spiritual atonement and salvation, and this desire drew heavily from dante's own experiences. dante was living in exile while writing inferno and so, much like his poetic counterpart, he felt like he had lost his way and needed direction.

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