—Hello, may I speak to John, please?
— .
A. Who are you?
B. What's the matter?
C. This is John speaking.
D. He is John.
网友回答
A. Who are you?
B. What's the matter?
(答案→)C. This is John speaking.
D. He is John.
解析：考查交际用语的用法。电话用语习惯使用“this is…”“who is that?”等等。