单选题
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?
【正确答案】
B
【答案解析】
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