Question

I have't seen_this one since I collected stamps.A.as a stamp

Answer 1

应该是a stamp as old as 吧

as...as意为"和……一样",表示同级的比较.使用时要注意第一个as为副词,第二个as为连词.其基本结构为：as+ adj./ adv.+as.例如：

This film is as interesting as that one (is).

这部电影和那部电影一样有趣.

Your pen writes as smoothly as mine (does).

你的钢笔书写起来和我的一样流畅.

所以选C

从我收集邮票以来没见过跟这个一样古老的.