A: Would you like a cup of coffee? B:（）
A: That’s Research and Development.
B: No， thank you.
C: Yes.
D: Thank you.
出自：国家开放大学《商务英语(本科)》
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A: Would you like a cup of coffee? B:（）
A: That’s Research and Development.
B: No， thank you.
C: Yes.
D: Thank you.
出自：国家开放大学《商务英语(本科)》