7.Carnivorous mammals can endoure what would otherwise be lethal levels of body heat because they have a heat-exchange network which kept the brian from getting too hot.
A.which kept
B.that keeps
C.which has kept
D.that has been keeping
E.having kept
OG.解釋:
"The two underlined words contain two separate errors. The pronoun which introduces nonrestrictive clauses, which include information relevant but not critical to an understanding of the sentence. The pronoun that introduces a restrictive clause, which is critical to understanding the sentence because the clause defines its antecedent. Here, the clause following which defines beat-exchange network, so that must be used in place of which.
我的問題是:which 不接 "," 時,不是代表限定用法嗎,如:
"The old man has a son who is in the army."(quote the ex. of agk99)
為何在這題中,解釋會說which 為非限定用法呢?