Itissaidthatsixtyper的精選

問題詳情：Itissaidthatsixtypercentofallenergy________intheworldtodayisbeinglostaswastedheat.A．produced  B．producingC．toproduceD．havingproduced【回答】解析：考查非謂語動詞。句意：據説現在世界上生產的60%的能源...