I haven’t seen this since I collected stamps.
A. as old a stamp as
B. so an old stamp as
C. stamp as old as
D. as an old stamp a
网友回答
(答案→)A. as old a stamp as
B. so an old stamp as
C. stamp as old as
D. as an old stamp a
解析：表示“象这么旧的邮票”可用以下形式表达：as old a stamp as this； a stamp as old as this；否定句中前一个as可用so。