一I still cannot figure out why he missed his flight．
一He       an accident on the way to the airport．
A．could have hadB．should have had
C．would haye hadD．must have had
A
考查情態(tài)動詞和虛擬語氣�！拔胰匀徊焕斫馑窃趺村e過航班的�！薄八赡茉谌C場的路上遇到事故了。”could have done表示不太肯定的推測，“可能已經(jīng)做了某事”；should have done“本應(yīng)該做某事”；D“一定已經(jīng)做了某事”。根據(jù)答語可知，表示的是不太肯定的推測。故選A。
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