—Why does Mary look so worried today?
—I’m not sure, but she _____ a small accident driving here.
A．must haveB．might haveC．must have hadD．might have had
D

試題分析：考察情態(tài)動詞用法。“情態(tài)動詞+have done”表示對過去情況的虛擬或者推測；“情態(tài)動詞+動詞原形”表示對現(xiàn)在情況的虛擬或者推測。句義：—為什么Mary今天看起來很擔(dān)憂��？—我不清楚，也許是在開車來的時候，出了點小事故吧！根據(jù)句義可知是對過去發(fā)生的事情的推測。Must have done一定做了某事，表示對過去所發(fā)生的事情有把握的肯定推測。Might have done也許做了某事，表示沒有把握的推測。故D正確。
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