——I’d like to book a flight to Shanghai, please.
—— .
A. No, of course not
B. Do you mind if I said no?
C. Yes, sir, single or return?
D. You can’t. We are busy
网友回答
A. No, of course not
B. Do you mind if I said no?
(答案→)C. Yes, sir, single or return?
D. You can’t. We are busy
解析： 本题考查交际用语。根据句意：——我想订一张到上海航班的机票。——好的，先生，单程还是双程？其它句意与题目不相符合。