题目内容：

that is the reason __John refuse to speak at the meeting.
why or that?
不是说有一种情况什么不用why 用that

优质解答

应该是why
若句子改成这样that is the reason that I give you.就用that,因为在此句中,the reason为中心词,that在定语从句中作give的宾语,这种情况用that,不用why