The origin of the "Final Solution," the Nazi plan to exterminate the Jewish people, remains uncertain. What is clear is that the genocide of the Jews was the culmination of a decade of Nazi policy, under the rule of Adolf Hitler. The "Final Solution<span>" was implemented in stages.
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I’m not sure what the question is. “Come” would be the correct present tense for the sentence, but if you need a different word with the same meaning to replace it with, then you can use “arrive” instead.
I hope this helped, if not, then you can reply specifying what the question is.