It's probably that awful music that wakes me up every morning.

问题描述:

It's probably that awful music that wakes me up every morning.

it 没有特定的指什么东西,或者可以说,it指的就是那个说不清的、不特定的东西
口语里这样很普遍
根据回答,语境估计是有人问
”You seem tired. Haven't you been sleeping well?"
"你似乎有些疲劳.最近没睡好吗?”
回答
It's probably that awful music that wakes me up every morning.
估计是那难听的音乐每天早晨把我给吵醒
(不算是特别通畅的翻译但基本是这么说的)
这里 It 指 “原因”, It is probably ... 原因估计是.
尽管提问这没有明确的问
“你为什么这么疲劳呢?”
可以想象他的问题就被这么理解了. 两方都有些含蓄,但是人际交往中难免的.