题目

4. ---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：C 解析: 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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