问题详情

Jack：__________
Lora： I’ m an engineer.
Jack： Oh, are you？
Lora： How about you？
Jack： I work for a trading company.
A.How are you doing？
B.What do you do？
C.How do you do？
D.What are you doing？请帮忙给出正确答案和分析，谢谢！