BE busy with 还是 BE busy to

BE busy with 还是 BE busy to be busy with study还是be busy at study be busy with与be busy at "be busy to do " 还是 " be busy doing" 1.be busy(in )doing 2.be busy to do 3.be busy with 4.be busy be busy with与be busy in be busy with sth be busy with be busy to do 用be busy with 造句 be busy with sth 与be busy to do sth的区别 be busy with sth 与be busy doing sth be busy with和be busy at 的区别