题目

. Tony was very unhappy for _______ to the party. A. having not been invited    B. not having invited  C. having not invited         D. not having been invited 答案：D蜂蜡是一种非晶体物质，它在熔化过程中要    （选填吸热或放热），温度    （选填升高、不变或降低）．