A: Your bicycle looks very nice. When did you buy it?

B: Oh, I ______ it for three months. It's a birthday present from my uncle. [ ]

A. bought

B. have bought

C. have received

D. have had

患者男性，21岁，肛门部肿物伴坠痛，异物感一天，小发热，无便血。视诊：肛缘左侧紫红色半圆形肿块，花生米大小，质中等硬，触痛。初步诊断为（）

A.内痔脱出嵌顿

B.直肠息肉

C.结缔组织外痔

D.炎性外痔

E.血栓性外痔