题目：
— Michael was late for Mr. Smith's oral class this morning.
— _________? As far as I know, he never came late to class.[ ]
A. How come
B. So what
C. Why not
D. Guess what
答案：
答案：A
— Michael was late for Mr. Smith's oral class this morning.
— _________? As far as I know, he never came late to class.[ ]
A. How come
B. So what
C. Why not
D. Guess what
答案：A
面深龋，冷诊（+++），穿髓孔小，探痛（+++），叩痛（±），就诊时医生在局麻下开髓拔髓，未扩管，封CP药捻，当晚出现剧烈疼痛，牙松动Ⅲ度，叩痛（++）。