Question

She was listening to _the__radio.为什么用the？

Answer 1

listen to the radio 表示“，听广播，收听收音机”，是固定搭配，radio 表示“收音机”，是可数名词，前面要加限定词，而一般加定冠词the。

句意：她正在收听收音机。

祝您学习进步，更上一层楼！(*^__^*)……

Answer 2

She was listening to the radio.
radio 做广播讲时不可数，做收音机讲时可数，这里是她正听广播，所以不能用a，可以说She was listening to a radio station. 或 a radio show 或a radio rip 或者 She was listening to a song.

Answer 3

这里的the是特指她正在听录音机，总不能说她正在听一个录音机（a radio)吧