—Sorry, I have to ________ now. I have a train to catch.
—Goodbye! Wish you a pleasant journey.
| A．ring out. | B．call out | C．call on | D．ring off |
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—Sorry, I have to ________ now. I have a train to catch.
—Goodbye! Wish you a pleasant journey.
| A．ring out. | B．call out | C．call on | D．ring off |
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