Having been working in this school for over 20 years, Mr. Brown

Having been working in this school for over 20 years, Mr. Brown is ______ an inexperienced teacher.
A、by no means
B、by any means
C、by all means
D、by every means
【正确答案】：A
【题目解析】：by no means 绝不；句意：布朗先生在这所学校工作了20多年，绝对不是一个没有经验的教师。