used to do sth和be used to doing sth中的used是什么词性?

used to do sth和be used to doing sth中的used是什么词性? use的用法.used to do sthbe used to do sth be used to doing sth be used to doing sth? be used to doing sth.和used to do sth.的分别 be used for doing sth和be used to do sth一样吗? be used to+doing sth是什么意义 区分used to do sth./be used to doing/be used to do 区别(used to do sth 和be used to be/get used to doing sth和be used to do 用法区别~ be used to do sth.be used doing sth.for one to talk to . Be used to do sth Be used to doing sth 后者的to为何做介词? used to do sth,be used to sth ,be used to do sth