The speech by Professor Smith was so interesting that the students talked about it all th

问题补充：

The speech by Professor Smith was so interesting that the students talked about it all that day.

A. to be delivered

B. to be given

C. being delivered

D. delivered

答案：

A. to be delivered

B. to be given

C. being delivered

(答案→)D. delivered

解析：原句意思是，由史密斯教授发表的演讲太精彩了，以至于学生们一整天都在谈论它。通过分析句子结构，句子主语“演讲”和非谓语动词“发表”之间是被动关系，所以应该用过去分词作定语，故选D。