请翻译并解释选项下列英语

问题描述:

请翻译并解释选项下列英语
.At the conference, over 20 presidents and professors from many well-known universities _________ their speeches about education,
A.showed B.delivered C.passed D.undertook

这一题选择B,翻译如下:会上出自世界知名大学的20多名校长与教授就教育这个话题都发表了演讲.这是固定搭配.相当于是我们以前学过的最基础的发表演讲的说法:give a speech.