这句话有几个助动词The work has been done by tom .has 和 been哪个是助动词 为啥

这句话有几个助动词The work has been done by tom .has 和 been哪个是助动词 为啥 All the work (has/have) been done successfully,选哪个? 现在完成时的结构 主语＋ 助动词 have has＋been＋done＋过去分词是什么意思? 这是一道选择题：___ work has been done to improve the people's livin Tom has never been to China.．（在第一个助动词后） The boss asked,“Has all the work been done?” the work has been finished the work was finished.这两句话 有什么区别吗 the room has been cleaned by tom 对tom提问 we would have been in time for the game里面would和have哪个是助动词? 这是反意疑问句陈述部分是The work has never been done,疑问部分是什么 现在完成时的结构 主语＋ 助动词 have has＋been＋done＋过去分词是什么意思?关键 has been done 和has been 区别是什么