题目

—I'd better ________ now.The water is boiling in the kitchen. —Goodbye. A．ring off                          B．ring up C．hold on                           D．ring back 答案：A　根据语境应是“挂断电话”，故答案为A。ring up意为“打电话”；hold on意为“不挂断”；ring back意为“回复电话”。

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