问题
Jack, I want to change my job. You know I haven’t achieved anything since I took up teaching. — Really? There is not a job considered the best one! As we all know, ______!
A:misfortunes tell us what fortune is.
B:all is well that ends well.
C:if a thing is worth doing it is worth doing well.
D:every profession produces its own best.
B:all is well that ends well.
C:if a thing is worth doing it is worth doing well.
D:every profession produces its own best.
正确答案是：
