---Did you listen to the lecture?---Yes I have never heard a one. A. more excitingB. mor

问题补充：

---Did you listen to the lecture?

---Yes, I have never heard a one.

A. more exciting

B. more excited

C. most exciting

D. most excited

答案：

(答案→)A. more exciting

B. more excited

C. most exciting

D. most excited

解析：考查形容词用法。本题中的名称是one就是指lecture,是一个指物的名词，应该使用现在分词转换的形容词来修饰。形容词的比较级与否定词连用表示最高级的含义。句意：—你听过这演讲吗？—是的。我从来没有听过比这个更让人兴奋的演讲了。故A正确。