Carnivorous mammals can endure what would otherwise be lethal levels of body heat because they have a heat-exchange network which kept the brain from getting too hot.
Carnivorous mammals can endure what would otherwise be lethal levels of body heat because they have a heat-exchange network wich kept the brain from getting too hot.
A.which kept B.that keeps C.which has kept D.that has been keeping E.having kept 答案根据时态很好选是B 但是这里关于which的OG解释我不是很明白。在GMAT中which 是怎么考的 求牛人解答啊