新东方在线：考研英语核心词汇84
be busy with sth. 忙于某事be busy doing sth. 忙于做某事
真题重现：
Alone in a deserted house, he was so busy with his research work that he felt anything but lonely.
他自己呆在一个废弃的屋子里忙于自己的研究工作，以至于一点都不感觉到孤独。(1990词汇)
造句：
He is busy with proving up a coal deposit.
他正忙于勘探煤层。
He is too Busy doing God knows what.
他太忙，不知道究竟在忙些什么。
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