题目内容

---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 stuckB．might stuck
C．might have been stuckD．must have stuck
选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。
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