虚火上浮型鹅口疮，可依情选用（）

A.清热泻脾散

B.知柏地黄丸

C.附子理中汤

D.参苓白术散

E.牛黄解毒丸

---How long have you been studying in No.2 Middle School?

---Less than half a year.

---So it will be two years and a half _______ you graduate from this school.[ ]

A.when  

B.after        

C.before    

D.while