题目内容
—I wonder why Sara looks worried today.
—I'm not sure,but she a small accident driving here.
A. could have B. might have
C. might have had D. must have had
C
考查情态动词的用法。根据I'm not sure可知表示对过去没把握的推测,故用might have done的形式。语境:---我不知道今天Sara为什么看起来焦虑。---我不确定。她可能驾车来这儿时遇到了小的意外事故。
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