3、nB.by;onC.by;by10.Sarah _______going to supermarket this evening. ( )A.areB.amC.is二、完形填空Theworld’sfirstundergroundrailwayLondonUndergroundwas1in1985,but2historydatesbackto18633the4firstundergroundrailwayopenedinLondon.Today,LondonUndergroundis5Majorbusiness6threemillionpassengerjourneysma