Its past, "have experienced" meaning they've already been through it
explaination:
Read the excerpt from "The Crab That Played with the Sea." Now, while the two were talking together, Pau Amma the Crab, who was next in the game, scuttled off sideways and stepped into the sea, saying to himself, 'I will play my play alone in the deep waters, and I will never be obedient to this son of Adam.
C. They feared the radicals who had taken power in France during the revolution
the letter P of president