问题
单项选择题
Don''t set him to talking philosophy or he''ll go on all evening.
A．off
B．on
C．at
D．of
答案
参考答案：A
解析：习惯搭配。set off出发，燃放，使……开动，使(某人)开始做某事；如：whatever you say will set her off crying．不管你说什么都会使她哭泣。set on攻击，教唆；因此选项A为答案。