1.I'm up to my neck in work我忙坏了
2.It's really pushing me over the edge这真让我抓狂
3.I'm afraid I can't恐怕我不能来
4.I have things to do我有事情要做
5.I'm kind of busy. Maybe later我有点儿忙,也许以后吧
6.I'm busy right now. Sorry我现在很忙,抱歉
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