参考答案：C

解析：[分析] 近义辨析。 privilege特权，特别待遇：I had the privilege of meeting the queen．我有会见王后的特权。occasion时机，机会：A birthday is no occasion for tears．生日可不是哭鼻子的时候。possibility可能性：There is no possibility of his coming．他不可能来。allowance宽容，允许，被允许的东西(如限额、限期等)：ask for an allowance of three days要求给三天时间。