一鼻疖患者突然表现寒战、高热、头剧痛，应首先考虑并发（）。

A.颊部蜂窝织炎

B.乙状窦血栓性静脉炎

C.上唇蜂窝织炎

D.海绵窦血栓性静脉炎

E.脑膜炎

My father was preparing for his speech _______ my mother was doing some washing last night.[ ]

A. if                

B. while

C. unless            

D. until