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—Why hasn’t Mr. Green showed up at the meeting yet?

—I’m not sure，but he         in a traffic jam driving here．

A．could be caught                                              B．can be caught

C．might have been caught                                     D．must have caught

—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 have been stuck

C．might be stuck  D．must have been stuck

---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