—Sorry, I have to ring ________ now. It's time for class.
—OK, I'll call back later.
off　
ring off“掛斷電話”；break up“分解；分裂；拆散”；give off“發(fā)出”；hold up“支撐；耽擱”。由句中出現(xiàn)的call back later可知，此處應選擇與打電話有關的短語。
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