-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
C
表示對過去已經(jīng)發(fā)生事情的推測應(yīng)該用情態(tài)動詞的完成時形式，但might的可能性不大；結(jié)合上下文的意思可以知道應(yīng)該用被動形式。
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