—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
—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。