---What should I do first before boarding? ----().A.You may ask the policeman there to help.B.Please go to the airline counter to check-in for your flight.C.You should wait and see.D.You have to go there to check in for your flight.

---What should I do first before boarding? ----().

A.You may ask the policeman there to help.

B.Please go to the airline counter to check-in for your flight.

C.You should wait and see.

D.You have to go there to check in for your flight.

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