gmat that指代问题OG-107While it costs about the same to run nuclear plants as other types of power plants,it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.(A) While it cost

gmat that指代问题OG-107While it costs about the same to run nuclear plants as other types of power plants,it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.(A) While it cost
gmat that指代问题
OG-107
While it costs about the same to run nuclear plants as other types of power plants,it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.
(A) While it costs about the same to run nuclear plants as other types of power plants,it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.
(B) While the cost of running nuclear plants is about the same as for other types of power plants,the fixed costs that stem from building nuclear plants make the electricity they generate more expensive.
(C) Even though it costs about the same to run nuclear plants as for other types of power plants,it is the fixed costs that stem from building nuclear plants that makes the electricity they generate more expensive.
(D) It costs about the same to run nuclear plants as for other types of power plants,whereas the electricity they generate is more expensive,stemming from the fixed costs of building nuclear plants.
(E) The cost of running nuclear plants is about the same as other types of power plants,but the electricity they generate is made more expensive because of the fixed costs stemming from building nuclear plants.
可是这里they指代costs,应该指代 nuclear plants

gmat that指代问题OG-107While it costs about the same to run nuclear plants as other types of power plants,it is the fixed costs that stem from building nuclear plants that makes it more expensive for them to generate electricity.(A) While it cost
我觉的--they generate the electricity--they指代的就是nuclear plants啊~costs怎么能产生电呢?
以下是我找的管卫东老师blog上的讲解~
题目分析；根据语义在前后句中应该存在一个两种成本的对比,A逗号前后都用it,B前后都用cost,C前后都用it,D前面用it后面用the electricity,E前面用cost后面用the electricity,只有B前后是cost进行对应,选B