问题补充:
—Sorry, the tickets have already been sold out.
—Really? Maybe I a little earlier.
A. should come
B. should have come
C. could have come
D. must have come
答案:
A. should come
(答案→)B. should have come
C. could have come
D. must have come
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。