You 'd better go to work________bus instead of________foot．A.by，byB.by，onC.on，onD.with，by
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B解析分析：介词by+不带冠词的单数名词(用……交通方式)，如：by bus，by bike，by plane，by underground…．但“步行”是on foot．(延伸)交通方式的句型转换：1)You'd better go to work by underground．＝You'd better take an underground train to go to work．＝You'd better go to work on an underground train．＝You'd better go to work by taking an underground train．2 ) He goes to work on foot．＝He walks to work．＝He goes to work by walking．3) He goes to work by car．＝He drives to work．＝He goes to work in his car．＝He goes to work by driving his car．4)He goes to work by bike．＝He tides a bike to go to work．＝He goes to work on his bike．＝He goes to work by riding his bike．