【题目】Toward the end of class, the teacher dealt in detail with the question _______ on at the beginning.
A. discussed B. touched
C. referred D. Cast
在线课程【答案】B
【解析】
试题分析：B考查动词词义辨析。A. Discussed讨论；B. Touched on提及，谈及；C. Referred参考，涉及；D. Cast on披上，涂上；句意：课堂快结束的时候，老师非常仔细的解释了课堂开始时谈及的问题。故答案为B选项。