问题补充:
— We expected you yesterday.
— Im sorry, I you 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
(答案→)D. should have called
解析:此处should+have done表示:应该做的事没做。句意:—我昨天等你了。— 对不起,我应该打电话告诉你,我今天才能来这儿。