No sooner had Mary begun her new job than she knew she had made a mistake.
A.As soon as Mary started working, she realized that her decision had not been a good one.
B.Had Mary not just begun a new job, she would have gone looking for a better one.
C.Just before Mary took up her new post, she realized that she was not suited for it.
D.Since Mary did not like her new job, she began looking for one more suitable to her.