A.ought to be not allowedB.ought not to be allowing

C.ought not to have allowedD.ought not to be allowed

【答案】D

【解析】

句意：他说这样的事情不许再发生。应该做某事ought to do，不应该做某事ought not to do，不被允许做某事ought not to be allowed，结合句意，考的是否定结构的被动语态。故选D。