— Tom is never late for work. Why is he absent today?

— Something __________to him.     [ ]

A. must happen  

B. should have happened    

C. could have happened    

D. must have happened

关于乙型脑炎的临床表现，哪一项是错误的（）

A.起病急，体温升高快，而且发热越高，热程越长，病情则越重

B.常有颅内压升高现象

C.有些病人出现抽搐、意识障碍

D.重症病例可出现呼吸衰竭

E.病程早期皮肤可见淤点