—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
网友回答
A. ring out.
B. call out
C. call on
(答案→)D. ring off
解析：短语辨析。A响起；B大声叫（喊）；叫出去；召唤，请来，调去；C号召；D挂断电话。结合句意可知D正确。句意：对不起我不得不挂断电话了。我要赶火车。