Good morning, may I speak to Mark, please？（）

Good morning, may I speak to Mark, please？（）
A.Who’s there？
B.Who’s that speaking？
C.Who are you？
D.Who wants to speak to Mark？
正确答案：B
解析: 电话用语，who is speaking？ “谁在讲话？”用以确认电话那头是谁。