Being a teacher, you must observe your behavior, for you say and do has a life-long effect on your students.
A. that
B. which
C. what
D. as
网友回答
A. that
B. which
(答案→)C. what
D. as
解析：
试题分析:考查连接词辨析。从结构可知for后面 you say and do是主语从句，从句中缺少宾语，排除A、D选项，而which得需要选择范围，所以答案选C，意思是“你所说的和所做的”。句意：作为一名教师，你必须要注重你的行为，因为你的言行对学生有着终身的影响。