题目内容
—Sorry, I have to ring ________ now. It's time for class.
—OK, I'll call back later.
off
【解析】ring off“挂断电话”；break up“分解；分裂；拆散”；give off“发出”；hold up“支撑；耽搁”。由句中出现的call back later可知，此处应选择与打电话有关的短语。
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题目内容
—Sorry, I have to ring ________ now. It's time for class.
—OK, I'll call back later.
off
【解析】ring off“挂断电话”；break up“分解；分裂；拆散”；give off“发出”；hold up“支撑；耽搁”。由句中出现的call back later可知，此处应选择与打电话有关的短语。