一个较难的英语完形填空（1个空）,

一个较难的英语完形填空（1个空）,
Luckily,the day came when his teacher asked him to play some holiday songs.He didn’t want to,but as he placed his fingers on the piano keys,he realized that he could show others that he had talent after all.That day he told his father what he had been waiting to hear—that he wanted to study with a new teacher.（46） that point on,everything turned around.
46、A：From B：At C：Since D：After
我想知道,from that point on 是短语还是别的原因而选from的,