—I wonder why Susan looks worried today.

问题选择题

—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

题目分析：句意为：----我想知道，Susan今天为什么看上去很忧虑呢？----我也不清楚，但是他可能遇到了一点儿小车祸。由后面的不太确定，可知应为might, 因为他看上去忧虑，所以事情应该发生了，故应为might have done.答案应为C。