题目

题型：不详难度：来源：

The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

A．held on

B．worked out

C．touched on

D．kept out of

答案

　C

解析

　　touch on简单谈到，由抠门的关键词：but mostly kept himself to the main topic.
可知答案。