Something terrible have happened if Li Chang was not ing to eat in his restaurant as he always did.
A. ought to
B. must
C. should
D. will
网友回答
A. ought to
(答案→)B. must
C. should
D. will
解析：考查情态动词+完成式的用法：A. ought to应该B. must必须C. should应该D. will将要，句意：如果李畅不象平常一样到他的饭店吃饭，一定发生了可怕的事情。Must have done是过去一定做了。ought to/ Should have done本该做却没做,选B