Something terrible if he didn’t e to the bar as he always did.
A. should happen
B. might happen
C. must have happened
D. can have happened
网友回答
A. should happen
B. might happen
(答案→)C. must have happened
D. can have happened
解析：考查情态动词+完成式的用法：句意：如果他没有象平常一样来到酒吧，那一定发生了可怕的事情。从句用的是过去时，说明应该用情态动词+完成式表示最过去事情的推测，排除AB。Must have done过去一定做了，can 用于推测一般用于否定和疑问句，选C。