题目内容
—I wonder why Susan 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
考查情态动词表推测。句意为“……但是,她开车来时或许出过小事故”。既然是I’m not sure“不确信”,应该用might来表达推测,后面给出的时间状语是driving here开车来时,所以用might have had。

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