Burns are called first，second or third degree burns， which layers of the skin are burned.
A. depending on
B. depended on
C. depend on
D. to depend on
网友回答
(答案→)A. depending on
B. depended on
C. depend on
D. to depend on
解析：考查分词做状语用法。Depending on视…而定,相当于according to…句意：根据被烧伤的皮层，烧伤被分为一级，二级和三级烧伤。故A正确。