Itissaidthatsixtyper的精选

问题详情：Itissaidthatsixtypercentofallenergy________intheworldtodayisbeinglostaswastedheat.A．produced  B．producingC．toproduceD．havingproduced【回答】解析：考查非谓语动词。句意：据说现在世界上生产的60%的能源...