She looks honest, but _____ she often tells lies.[ ]

A. in a fact

B. as matter of fact

C. actually

D. in an actual fact

患者，女性，9岁，右上中切牙萌出已经两年，两侧侧切牙萌出正常，左上乳中切牙不松动，唇侧牙龈肿胀，质硬。X线片显示左上乳中切牙根尖部有不规则阻射团块，左上中切牙高位，根尖近闭合，最可能的临床诊断是（）

A.牙瘤

B.额外牙

C.乳牙固连

D.乳牙滞留

E.左上中切牙异位萌出