问题补充：
—— We expected you yesterday.
—— Im sorry, Iyou to say that I couldn be here until today.
Ashould have called
Bmust have called
Ccould call
Dwould call
答案：
(答案→)A. should have called
B. must have called
C. could call
D. would call
解析：句意，这是两个人之间的对话。第一个人说：“ 昨天我们在期待着你的到来。” 第二个人说： “对不起，我本应该告诉你直到今天，我才能到这。 ”。 should have called表示本应该做某事而实际上没做；must have done通常只用于肯定句，表示对过去发生的事情或状态进行推测，语气比较肯定；could call表示一种可能性 would call表示意愿，故选A。
