题目内容：

Mr Smith is busy ____ his office
A in B with并说明原因
写错了,最后应该再加一个work,前面我抄的时候断句没断好

优质解答

be busy with sth忙于某事固定搭配给你些例句 更好You must be very busy with your call.你一定是忙着应酬吧.She's busy with some important work.她正忙于一些重要工作.be busy(in) doing sth 忙于做某事 He is b...