be busy doing sth.
[中考]忙着做……
be busy with / doing sth.
[中考]忙于做某事
go on doing sth.
[中考]继续做（某事）
go on with / doing sth.
[中考]继续做某事
keep doing sth.
[中考]继续做某事
stop d...
帮我总结一下有关to do和doing句式的短语
be busy doing sth.
[中考]忙着做……
be busy with / doing sth.
[中考]忙于做某事
go on doing sth.
[中考]继续做（某事）
go on with / doing sth.
[中考]继续做某事
keep doing sth.
[中考]继续做某事
stop d...