Hello. This is 755-0797
A、I will call again later.
B、Thank you for your help
C、I'd like to speak to Mary, please.
【正确答案】：C
【题目解析】：C. I'd like to speak to Mary, please.（我想和玛丽说话，请。）这个选项直接且恰当地回应了电话呼叫的情境。说话者已经接听了电话，并给出了他们的电话号码，接下来很可能是要询问对方想要与谁通话。因此，“我想和玛丽说话，请。”是一个合理且恰当的回应。
