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.
ACD选项中是the same to do as to do的形式,补充完整是 it costs about the same to run nuclear plants as (to run)other types of power plants.
所以CD选项中的for是多余的。
E选项中,x the same as y的形式,补充完整是 The cost of running nuclear plants is about the same as (the cost of runining) other types of power plants.
HERL讲解中说是用for替代了of running,不直接用of是因为running也省略了。如果直接是of的话,会被认为是其它核电站的成本,而非运营成本。所以E选项少了for,B选项正确。
这里介词for不能省略。