单项选择题

A. In a hotel. B. In the ticket-ordering hall.
C. In a restaurant. D. On a plane.
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单项选择题
A. I shouldn’t be late just now. B. I was not late.C.I was late for the concert. D. I was on time.
A. I shouldn’t be late just now.
B. I was not late.
C.I was late for the concert.
D. I was on time.
单项选择题
Knock ______ the door before you enter the room.
A. on
B. for
C. at
D. in
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