第20题: [单项选择]He was so convinced that people were driven by ______ motives that he could not believe that anyone could be unselfish. A. selfless B. personal C. ulterior D. remarkably 参考答案:C 答案解析:(ulterior隐蔽的,秘而不宣的)。句意为:他深信人们受隐秘动机的驱使,因此,他不相信人们会大公无私。A.selfless无私的;B.personal个人的,私人的;D.intrinsic内在的,