— What did you do on May Day?

— I went shopping with my family. There _____ so many people in the street. [ ]

A. was

B. are

C. were

患者男性，8岁，因“上颌后部牙龈肿”来诊。口腔检查：乳牙右上4远中邻洞，叩诊不适，松动Ⅱ度，牙龈红肿。X线片：乳牙右上4根分叉及根尖暗影，牙根吸收。

最可能的诊断是（）

A.龋

B.牙髓炎

C.根尖周炎

D.牙龈炎

E.牙周炎