單項選擇題- Yes, I will try my best.() 

A.Do you know about business tax
B.Can you give me a brief introduction about business tax
C.What do you think about business tax


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2.單項選擇題一 Hello! ?- Hello, this is Michael from Tianjin Vanguard Trading Inc.() 

A.Who are you?
B.What are you?
C.Who is that?