题目

—I'm afraid Mary isn't in. —Oh well，I'll________later. A．ring back                       B．ring off C．ring up                         D．ring out 答案：A　ring back(＝phone sb.again)再打电话来；ring off挂断电话；ring up给……打电话；ring out发出响亮而清晰的声音。句意：——恐怕玛丽不在家。——好吧，我晚会儿再打来。

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