问题补充：
--- We expected you yesterday．
--- Im sorry, Iyou to say that I couldn be here until today．
A. must have called
B. would be calling
C. could have been calling
D. should have called
答案：
A. must have called
B. would be calling
C. could have been calling
D. should have called
解析：考查情态动词的用法。此处should+have done表示：应该做的事没做。
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