He said that he would come here and()he could give us a talk.

答案为C He said后面跟了两个由that引导的宾语从句,第一个that he would come here中的that 可以省略也可以不省,但第二个that he could give us a talk.中的that不能省略.所以完整的句子应该是：He said that he would come here and that he could give us a talk.答案B和D不符合句子要求的原因在于,原句意思和结构已经完整.