题目选项分析

Unlike the body's inflammatory response to cuts and sprains, in which widespread swelling and stiffness immobilize the injured area until healing, instead, the body's more localized response to sunburn results in a distinct line dividing affected and unaffected areas of the skin.

Unlike the body's inflammatory response to cuts and sprains, in which widespread swelling and stiffness immobilize the injured area until it has healed, the body's more localized response to sunburn results in a distinct line dividing affected and unaffected areas of the skin.