4、beusedtodoDon'tthrowawaythepapers.Theycanbeusedtomakeafire.Woodcanbeusedtomakepaper.1.【2015兰州】Thisplace_______afactorybutnowitisapark.A. used to beingB. used to beC.is used toD.using to be2.【2016云南省】Maryusedto________inthecountryside,butnowsheisusedto___