— I'm sorry to hear that Bill failed the exam again.

— Don't worry about him. I'm sure that he will never give up until he _____.[ ]

A. succeed

B. succeeds

C. succeeded

闭锁综合征见于（）

A.大脑前动脉闭塞

B.大脑中动脉闭塞

C.小脑梗死

D.双侧脑桥基底部梗死

E.脊髓前动脉闭塞