问题补充：
I don’t know why he is late.
—Nor do I.Hean accident.
A. could have had
B. should have had
C. might have had
D. must have had
答案：
A. could have had
B. should have had
(答案→)C. might have had
D. must have had
解析：may/might have done表示对过去发生情况的可能性推测。
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