1、忙着做
... do well in 在..方面做得很好 be busy doing 忙着做.. be worn out 被磨坏了/累坏了 ...
2、忙于做某事
... prefer doing to doing 喜欢做某事而不喜欢做某事 be busy doing 忙于做某事 be worth doing 值得做某事 ...
3、忙于做
... be bound to 必定;必需 be busy doing 忙于做(某事) be capable of (指人)有某种才能或偏向的 ...
be e busy doing sth忙于
be kept busy doing sth被迫忙于
be busy doing sty忙于做
be busy doing sth忙于做某事;忙于;忙于干某事;忙于做
be busy doing detail忙于做
be busy doing stn忙于做某事
be busy doing something忙于做某事;忙做;忙于做
doing be busy doing sth忙于干某事
playing be busy doing sth忙于做某事