—May I see your ticket please? I think you in my seat.—Oh you’re right. My seat is upst

问题补充：

—May I see your ticket, please? I think you in my seat.

—Oh, you’re right. My seat is upstairs. I’m terribly sorry.

A. are sitting

B. sit

C. sat

D. have sat

答案：

(答案→)A. are sitting

B. sit

C. sat

D. have sat

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