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：[分析] 习惯搭配。 setoff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。