【TheprocessofproducingelectricitymayalsogiveoutCO2，_______youheatyourhousewithelectricityinsteadofcharcoal．（）A.evenifB.aslongasC.asifD.assoonas】

　　The process of producing electricity may also give out CO2，_______ you heat your house with electricity instead of charcoal．（）

　　A.even if

　　B.as long as

　　C.as if

　　D.as soon as