问题
选择题
-I wonder why Mr Green hasn’t showed up at the meeting yet.
-I’m not sure, but he _______ in a traffic jam driving here.
A．could be stuck
B．might stuck
C．might have been stuck
D．must have stuck
答案
答案：C
表示对过去已经发生事情的推测应该用情态动词的完成时形式，但might的可能性不大；结合上下文的意思可以知道应该用被动形式。