You should never lose your temper with the students; , they are only kids.
A. in all
B. after all
C. at all
D. first of all
网友回答
A. in all
(答案→)B. after all
C. at all
D. first of all
解析：考查词组辨析：A. in all总共，B. after all毕竟，C. at all根本D. first of all首先，句意：你不能对学生发脾气，毕竟他们是孩子。故选B。