以下句子哪个是警示性句型?
A.I firmly believe that the relationship between people will be harmonious and our society will be a better place for us to live in. B.I believe a happy and bright future is awaiting us if we make every effort to promote cultural development both nationally and internationally. C.Not surprisingly … demands/ requires/ deserves immediate/ serious attention/ consideration. D.Undoubtedly/ Obviously/ Consequently/ Clearly, … is valuable/ worthwhile for …正确答案C
