OG7

7 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

E having kept

解释中说which introduces nonrestrictive clauses, which include information relevant but not critical to an understanding of the sentence. that introduces a restrictive clause, which is critical to understanding the sentence because the clause defindes its antecedent. 这两句话怎么理解呢

Which 前面加逗号的形式引导的不是才能叫非限定性定语从句吗？是所有的“，Which”引导的句子都会有像OG上说的那样可能知道前面句子中任何一个东西所以指代不明确吗

用which修饰前面必须有逗号，一般情况下优先选用that，此题中A里面的keep也错，应该用keeps。

which就近修饰它前面的名词，通过谓语的单复数可以保证其跳跃修饰，但是如果谓语是单数，前面很多单数名词时，就近修饰。

说了这么多你会发现which很麻烦，多以that优于which，优选that，但是除了介词+which的情况，这种情况下修饰更准确。

介词+which优于where，when之类的关系连词