I was surprised ______little birds could eat ______ many insects in ______ a short time. [      ]

A. that so; so; such

B. that so; such; such

C. that such; so; so

D. that such; so; such

患者，男，45岁，诉进食时牙酸痛。检查：双侧上颌第一前磨牙颊侧颈部缺损，未见龋坏及隐裂纹，颊侧牙龈萎缩，口腔卫生良好，每日刷牙两次。该患者的诊断是（）

A.慢性根尖周炎

B.急性根尖周炎

C.牙髓坏死

D.牙本质过敏症

E.慢性牙髓炎