19.A 某人自己的,of one's own 20.C be used to doing /sth习惯于做某事,21.B 某人自己的,of one's own22.C be used to doing /sth习惯于做某事23.C be used to do 被用来做某事 24.A used to do 过去曾经或过去常常做某事.
19.A 某人自己的,of one's own 20.C be used to doing /sth习惯于做某事,21.B 某人自己的,of one's own22.C be used to doing /sth习惯于做某事23.C be used to do 被用来做某事 24.A used to do 过去曾经或过去常常做某事.