Jack is busy _____ (work on)some math problems.在线等,好的必定加分!望大家抢答!

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Jack is busy _____ (work on)some math problems.在线等,好的必定加分!望大家抢答!

Jack is busy _____ (work on)some math problems.在线等,好的必定加分!望大家抢答!
Jack is busy _____ (work on)some math problems.
在线等,好的必定加分!望大家抢答!

Jack is busy _____ (work on)some math problems.在线等,好的必定加分!望大家抢答!
working on
应该是be busy doing sth.吧