3道英语选择题,求详解
麻烦详细解释一下～～谢谢!
（）hearing the bad news, she immediately went home.
A: atB:onC:while
( ) he once went bankrupt, he thought of ending his life.
A:whenever B:as C:when
he let the artist ( ）picture of him.
A:to paint B:paint C: painted