from then on & ever since then的区别
Clinton was born in a poor family in 1946.Three months before he was born,his father,William Blats,died in a traffic accident.
_______ he tried to work hard at his courses at school and made up his mind to be a useful man.
A.from now on B.From then on C.Ever since then D.Now that
选哪一个,为什么,