问题
单项选择题
He added a ______ to his letter by saying that he would arrive before 8 pm.
A. presidency
B. prestige
C. postscript
D. preliminary
答案
参考答案：C
解析： C选项“postscript附言、后记”符合句意；A选项presidency“任期”；B选项prestige“声望、威望”；D选项preliminary“预备的、初步的”，都不正确。本句空格处意为“他在信中又加了附言”，因此C选项为正确答案。