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—Excuse me, may I take a seat here?

—______. The man on the seat has left.

A. You’d better not        B. No, thanks         C. Yes, please       D. I’m afraid not

—Excuse me, may I take a seat here?

—______. The man on the seat has left.

A. You’d better not　 　 B. No, thanks

C. Yes, please　　 D. I’m afraid not

—Excuse me，may I take a seat here?

—________ The man on the seat has already left.

A. You'd better not. B. Yes，please. C. No，you can't