题文
—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. |
—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. |
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