1) He was busy with his work.
他忙于工作。
3) He was busy with his writing.
他忙于写作。
4) He is busy at work.
他忙着工作。
5) be busy with research
忙于研究工作
6) He has been up to the eyes in work recently.
他近来工作极忙。
补充资料：工作
①从事体力或脑力劳动，也泛指机器、工具受人操纵而发挥生产作用：积极～ㄧ开始～ㄧ铲土机正在～。②职业：找～ㄧ～没有贵贱之分。③业务；任务：～量ㄧ宣传～ㄧ工会～ㄧ科学
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条