foot____ watch___thin_____加减或更换一个字母,使所给的词变成另一个新单词

foot____ watch___thin_____加减或更换一个字母,使所给的词变成另一个新单词 They didn't go to work by bus.They went to work on foot instead.同意句They went to work on foot____ ______by bus. We should have to go home on foot____ we to work another hour.A.if B.were C.had D.should为什么选B?先谢谢各位了解释得清楚点吧!拜三拜了!翻译一下吧 练习：写出下列各词的复数 I ____we____him _________this ___________her ______练习：写出下列各词的复数 I ____we____him _________this ___________her ______ watch _______child _______photo ________diary ______ day________ foot____