I haven’t seen this since I collected stamps.
A. as beautiful a stamp as
B. so anbeautiful stamp as
C. stamp as beautiful as
D. as anbeautiful stamp a
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(答案→)A. as beautiful a stamp as
B. so anbeautiful stamp as
C. stamp as beautiful as
D. as anbeautiful stamp a
解析： 题意：自从我集邮我从没见过这么漂亮的邮票。表示“象这么漂亮的邮票”可用以下形式表达：as beautiful a stamp as this； a stamp as beautiful as this；否定句中前一个as可用so。