Under no circumstances         to the teacher.  

A．is this the first time he has lied

B．this is the first time he has lied

C．is this the first time has he lied

D．this is the first time he is lying

口干症状见于（）。

A.白斑

B.复发性口腔溃疡

C.白色念珠菌病

D.球菌性口炎

E.扁平苔藓