英语改错Second,if a person cannot breathe,do your best to start
英语改错
Second,if a person cannot breathe,do your best to start his breathing at once,use a mouth to mouth way.答案是把use改为using,表伴随.但这样不就缺主语了吗?难道do your best to start his breathing at once是句子,可我再怎么看,do one'best to do sth.也是短语呀?