Answer:
steadily adverb (GRADUALLY)
Explanation:
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"<span> Polish and British cryptologists had already developed alternative methods of recovering the daily keys. "
Just before it, the passage says "the Germans introduced additional rotors and plugs... increase the number of possible combinations".
As this was expected, so the Polish and British "<em>already</em> developed alternative methods"
hope this helps</span>
Buddhist Priest often harrasses the narrator