When acute passes into chronic inflammation, the pain ________, and ultimately entirely ceases which may lead to the impression that the inflammation has been extinguished.
句意： 急性炎症转化为慢性炎症时， 疼痛会减轻并最终停止， 这也许会令人以为炎症消失了。 mitigate特指（病痛） 减轻， 因此， 本题的正确答案为 C。