—Mom, I did not pass the exam.
—What a pity! You it.
A. can pass
B. should have passed
C. must pass
D. must have passed
网友回答
A. can pass
(答案→)B. should have passed
C. must pass
D. must have passed
解析：考查情态动词+完成式的用法：从第一句话可知是说的过去的事情，排除AC，句意：--妈妈，我没有通过考试。--真遗憾，你本可以通过的。Should have done本该做却没做，must have done过去一定做了。选B。