一个问题中含有on the back foot

一个问题中含有on the back foot This is my roon ,____there is a picture of my family.回答一个问题选项A:on the back wall B:on back wallC:at the back wall D:at back wall说出为什么 on the back of on the way back pat on the back THE ELECTRICITY STILL DID NOT COME BACK ON.中COME BACK ON Put the glass back on the table!back在这个句子中作什么成分. on the back of the get back on the horse back on the rocks歌词 The power is back on. 英语翻译问题：Settling back on the bed as it fast forwarded to the song, the country on the back of the On the back of the photo on the back of the photo She什么the note on the back Age looks back on the happiness of youth.look back on是一个短语吗?不是的话,on起什么作用? It's time to go back home.let's say ' ' to our teacher.The boys like playing very much填一个含有字母组合“oo”的单词我提了两个问题。PLAYING后面填什么