问题
选择题
—I wonder why Suzan 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
答案
答案：C
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。