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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