从方框中选择合适的选项补全对话。
A. Where is the computer room?
B. Is that the computer room?
C. Do you have a computer room?
D. This way, please.
E. How many classrooms are there in your school?
Lucy: Welcome to our school.
John: Oh, it's so big! 1．
Lucy: Twenty.
John: 2．
Lucy: Yes, we do.
John: 3．
Lucy: No, it isn't. It's the teachers' office.
John: 4．
Lucy: It's on the second floor. 5．
John: Thank you.
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