题目内容
（请给出正确答案）
[主观题]
Joan: Could you get me Extension 6459, please？ Operator: ______A．Hello？ This is Tom Brown.
Joan: Could you get me Extension 6459, please？ Operator: ______
A．Hello？ This is Tom Brown.
B．Sure. Here you are.
C．Sorry. The line is engaged.
D．John Smith's office. What can I do for you？
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