You should never lose your temper with the students; ___, they are only kids.A.in allB.after allC.at allD.first of all
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B解析试题分析：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。考点：考查词组辨析
点评：英语中有的词组很相似，这几个都有all，但意思却大相径庭，要记清每个词组的含义，做题时结合上下文来判断。