in
be busy doing sth.=be busy with sth.忙于做某事,
如：I'm busy with my homework.=I'm busy doing my homework.with后面接事（sth.）,沒有with的話后面要接做什么事（doing sth.）.
When I went into the office,the teachers were busy ____ preparing their lessons.(prep.)
When I went into the office,the teachers were busy ____ preparing their lessons.(prep.)
英語人氣：951 ℃時(shí)間：2020-04-24 01:03:21
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