大全202

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.

(A) which kept

(B) that keeps

(C) which has kept

(D) that has been keeping（B）

(E) having kept

Which不能引导限定修饰，that不能引导非限定，

所以只能是 n , which

and

n that对吗？

Which不能引导限定修饰

这句话哪里有讲

我认为这题得错误在于时态错

整个句子有事用的一般时，表示客观存在得事实，应该用一般现在时啊，所以只能选B