1. be seen doing和be seen to do的区别
be seen doing表被看到正在做某事；be seen to do 表被看到做某事（不表进行） He was seen to read a book He was seen reading a book
2. get busy with
get busy with sth. 忙于......(某事) get busy ( in ) doing sth. 忙于做谋事
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