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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.
-
<p>(A) which kept</p><p>(B) that keeps</p><p>(C) which has kept</p><p>(D) that has been keeping</p><p>(E) having kept</p>
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答案：
B
A. kept动词
式错误
B. 正确
C. which has kept动词形式错误
D. that has been keeping动词形式错误
E. having done做后置定语结构错误 
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