.–What made her so sad ?

--- ___ she failed in the exam.

A．That

B．Because

C．As

D．Since

以下哪一项不属于耳源性颅外并发症（）

A.耳后骨膜下脓肿

B.颈部贝佐尔德脓肿

C.迷路炎

D.周围性面瘫

E.乙状窦血栓性静脉炎