A：We are going to the concert this evening. Will you join us.
我们今天去听音乐会。你和我们一起去吗?
B：I'm very sorry I can't.
非常抱歉我不能去。
A：Why not?
为什么。
B：I've been snowed under with since my bosswas away on business.
因为老板出差了，我工作多得忙不过来。
注释:
be away on business：离开出差
go to the concert：去听音乐会