第1个回答 2011-03-07
I am used to doing something.我习惯做某事
it is used to doing something它是用来做某事
I used to do something我过去常做某事
第2个回答 2011-03-07
be used to doing sth,习惯于做某事
be used to do sth,被用来做某事
第3个回答 2011-03-07
be used to doing
习惯于做某事
be used to do
被用于做某事