—Sorry, the tickets have already been sold out.
—Really? Maybe I a little earlier.
A. should e
B. should have e
C. could have e
D. must have e
网友回答
A. should e
(答案→)B. should have e
C. could have e
D. must have e
解析：考查情态动词表推测。根据句意：—票都已经卖完了。—真的吗？或许我本该早点来。用should have done表示“本应该干某事”对过去的猜测。C项为“本可以早点来”；D项为“肯定早来了”。所以答案选B。