The policeman for his bravery is going to give us a speech tomorrow.A. to knowB. knownC

问题补充：

The policeman, for his bravery, is going to give us a speech tomorrow.

A. to know

B. known

C. having known

D. knowing

答案：

A. to know

(答案→)B. known

C. having known

D. knowing

解析：句意:那位出名的警察将明天给我们作一次演讲。这里整个句子已经有谓语动词，所以空格处只能用非谓语动词，policeman与know之间是动宾关系，应该用过去分词，故选B。