He is always telling the director how to run the business, is like teaching one's grandmother how to suck eggs.
A. that
B. which
C. what
D. as
网友回答
A. that
(答案→)B. which
C. what
D. as
解析：
试题分析:考查定语从句。由结构可知此处是非限制性定语从句，从句缺少主语，故答案选B。句意：他总是告诉主管如何去经营公司，这简直就是班门弄斧。